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Stiv
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How many days after the purchase of Product X does its stand Updated on: 13 Mar 2025, 10:39
Originally posted by Stiv on 18 Mar 2012, 04:25.
Last edited by Bunuel on 13 Mar 2025, 10:39, edited 2 times in total.
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How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.
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E
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Bunuel
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How many days after the purchase of Product X does its stand 18 Mar 2012, 06:38
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How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997 --> warranty period can vary from 29 days (the least possible warranty: from 31st of January to 1st of March) to 89 days (the greatest possible warranty: from 1st of January to 31st of March). Not sufficient.

(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997 --> warranty period can vary from 1 day (the least possible warranty: from 1st of May to 2nd of May) to 30 days (the greatest possible warranty: from 1st of May to 31st of May). Not sufficient.

(1)+(2) Intersection of the warranty periods from (1) and (2) is 29 and 30 days, still two possible answers. Not sufficient.

Answer: E.

Hope it's clear.
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How many days after the purchase of Product X does its stand 18 Mar 2012, 09:37
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Hi,

Heres my take on this

Statement 1 When Mark purchased Product X in January 1997, the warranty did not expire until March 1997

Maximum coverage period 90 days (Bought on 1 Jan Expires 31 March)
Minimum Coverage period : 30 days (Bought 31 Jan Expires 1 March )

Hence insufficient

Statement 2 When Santos purchased Product X in May 1997, the warranty expired in May 1997

Maximum coverage period 30 days (Bought on 1 May Expires 31 May)
Minimum Coverage period : 0 days (Bought 1 May Expires 1 May )

Combined also the statements not going to help thus Answer is E
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How many days after the purchase of Product X does its stand 31 Jul 2013, 23:16
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How many days after the purchase of Product X does its standard warranty expire?
(1997 is not a leap year.)
(1) When Mark purchased Product X in January 1997, the warranty did not expire
until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May
1997.

have a doubt in this ..plz correct me

In Statement 1: Maximum validity is from 1st January to 31st March
Minimum validity is from 31st January to 1st March ( WE ARE SURE that 31st march as well as 1st march is not an expiry date HERE)

= (31 + 28 + 31) = 90 days
= (1 + 28 + 1) = 30 days

In Statement 2: (2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.

Maximum possible validity of X is from 1st May to 31st may = 30 days( here we ARE ASSUMING THAT 31st is an expiry date according to the question so we cnnt include 31st day )
Minimum possible validity of X is from 1st May to 2nd May = 1 day


so the inetrsection of (1-30 ) and (30 - 90) is 30 ??
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How many days after the purchase of Product X does its stand 01 Aug 2013, 01:16
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nevagivup
How many days after the purchase of Product X does its standard warranty expire?
(1997 is not a leap year.)
(1) When Mark purchased Product X in January 1997, the warranty did not expire
until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May
1997.

have a doubt in this ..plz correct me

In Statement 1: Maximum validity is from 1st January to 31st March
Minimum validity is from 31st January to 1st March ( WE ARE SURE that 31st march as well as 1st march is not an expiry date HERE)

= (31 + 28 + 31) = 90 days
= (1 + 28 + 1) = 30 days

In Statement 2: (2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.

Maximum possible validity of X is from 1st May to 31st may = 30 days( here we ARE ASSUMING THAT 31st is an expiry date according to the question so we cnnt include 31st day )
Minimum possible validity of X is from 1st May to 2nd May = 1 day
so the inetrsection of (1-30 ) and (30 - 90) is 30 ??
Show more

The highlighted part is not entirely correct. It will be (30+28+31) = 89 days, as you can't include 1st of January.[The question states after the day of purchase]

The minimum will occur and the no of days would be : 28+1 = 29 days.

Thus, the range of validity for the warranty : \(29\leq{w}\leq{89}\)

Similarly, from the second statement, we would have \(1\leq{w}\leq{30}\)

Combining both, we have : w=29 or w=30. Insufficient.

Hope this helps.
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nevagivup
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How many days after the purchase of Product X does its stand 01 Aug 2013, 01:42
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thanku so much for ur reply..
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How many days after the purchase of Product X does its stand 01 Aug 2013, 01:51
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i am still little confused ..

y didnt we use the maximum validity upto 1st april because anyways its mentioned that it is not expired in Mach and question asked upto how long it can stand ...( 31st march is not an xpiry date : Should nOt we include that day wen it can be used upto )

like in secnd statemnt we are considering 31st of may ( product x can be usEd on 31st may )
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How many days after the purchase of Product X does its stand 01 Aug 2013, 01:57
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nevagivup
i am still little confused ..

y didnt we use the maximum validity upto 1st april because anyways its mentioned that it is not expired in Mach and question asked upto how long it can stand ...( 31st march is not an xpiry date : Should nOt we include that day wen it can be used upto )

like in secnd statemnt we are considering 31st of may ( product x can be usEd on 31st may )
Show more

The maximum validity from F.S 1 :

Purchased on 1st January --> The validity starts from 2nd January.
Validity didn't expire until March(The date can not cross over to the month of April) --> 31st March, i.e. the warranty was valid till 31st March.

The total no of days from 2nd Jan to 31st March = 30(Jan)+28(Feb)+31(Mar) = 89 days.

Hence, we ARE including 31st March.

Is this better?
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How many days after the purchase of Product X does its stand 08 Aug 2013, 23:01
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Im not sure :(

The first statement gives the range "did not expire until March 1997, doesn't that imply that it cant be nay lesser than March, thiugh it can be greater than March?


mau5
nevagivup
How many days after the purchase of Product X does its standard warranty expire?
(1997 is not a leap year.)
(1) When Mark purchased Product X in January 1997, the warranty did not expire
until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May
1997.

have a doubt in this ..plz correct me

In Statement 1: Maximum validity is from 1st January to 31st March
Minimum validity is from 31st January to 1st March ( WE ARE SURE that 31st march as well as 1st march is not an expiry date HERE)

= (31 + 28 + 31) = 90 days
= (1 + 28 + 1) = 30 days

In Statement 2: (2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.

Maximum possible validity of X is from 1st May to 31st may = 30 days( here we ARE ASSUMING THAT 31st is an expiry date according to the question so we cnnt include 31st day )
Minimum possible validity of X is from 1st May to 2nd May = 1 day
so the inetrsection of (1-30 ) and (30 - 90) is 30 ??

The highlighted part is not entirely correct. It will be (30+28+31) = 89 days, as you can't include 1st of January.[The question states after the day of purchase]

The minimum will occur and the no of days would be : 28+1 = 29 days.

Thus, the range of validity for the warranty : \(29\leq{w}\leq{89}\)

Similarly, from the second statement, we would have \(1\leq{w}\leq{30}\)

Combining both, we have : w=29 or w=30. Insufficient.

Hope this helps.
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How many days after the purchase of Product X does its stand 08 Aug 2013, 23:14
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Shibs
Im not sure :(

The first statement gives the range "did not expire until March 1997, doesn't that imply that it cant be nay lesser than March, thiugh it can be greater than March?


mau5
nevagivup
How many days after the purchase of Product X does its standard warranty expire?
(1997 is not a leap year.)
(1) When Mark purchased Product X in January 1997, the warranty did not expire
until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May
1997.

have a doubt in this ..plz correct me

In Statement 1: Maximum validity is from 1st January to 31st March
Minimum validity is from 31st January to 1st March ( WE ARE SURE that 31st march as well as 1st march is not an expiry date HERE)

= (31 + 28 + 31) = 90 days
= (1 + 28 + 1) = 30 days

In Statement 2: (2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.

Maximum possible validity of X is from 1st May to 31st may = 30 days( here we ARE ASSUMING THAT 31st is an expiry date according to the question so we cnnt include 31st day )
Minimum possible validity of X is from 1st May to 2nd May = 1 day
so the inetrsection of (1-30 ) and (30 - 90) is 30 ??

The highlighted part is not entirely correct. It will be (30+28+31) = 89 days, as you can't include 1st of January.[The question states after the day of purchase]

The minimum will occur and the no of days would be : 28+1 = 29 days.

Thus, the range of validity for the warranty : \(29\leq{w}\leq{89}\)

Similarly, from the second statement, we would have \(1\leq{w}\leq{30}\)

Combining both, we have : w=29 or w=30. Insufficient.

Hope this helps.
Show more

No. It only means that it can be valid till the last day of March and DOESN'T run into the month of April.

If I say this ticket is valid until tomorrow, will it be valid after that? It won't.

Hope this helps
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How many days after the purchase of Product X does its stand 08 Aug 2013, 23:43
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Stiv
How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.

If someone can explain, I would be grateful.
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Yeah it does but why 29 days its not a leap year no?
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How many days after the purchase of Product X does its stand 11 Nov 2013, 22:43
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Bunuel
How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997 --> warranty period can vary from 29 days (the least possible warranty: from 31st of January to 1st of March) to 89 days (the greatest possible warranty: from 1st of January to 31st of March). Not sufficient.

(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997 --> warranty period can vary from 1 day (the least possible warranty: from 1st of May to 2nd of May) to 30 days (the greatest possible warranty: from 1st of May to 31st of May). Not sufficient.

(1)+(2) Intersection of the warranty periods from (1) and (2) is 29 and 30 days, still two possible answers. Not sufficient.

Answer: E.

Hope it's clear.
Show more
Hello Bunuel,

I have a query on this solution...

I think the most confusing part here is not the calculation but understanding the meaning of 'until'
From your explanation it seems when you say until 1st of March, you are not including 1st of march while counting days....
29 days (the least possible warranty: from 31st of January to 1st of March) = 1 + 28 + 0 = 19
89 days (the greatest possible warranty: from 1st of January to 31st of March) = 31 + 28 + 30 = 89

I tried to find more on meaning of until and it seems there is no clear understanding when until date in mentioned.
PFA few links
https://www.quickanddirtytips.com/educat ... e-the-date
Above link concludes that until includes the date but recommends to consider other case also, so this is not helpful from GMAT perspective.
Its not clear from below online dictionaries as well...
https://www.thefreedictionary.com/until
https://www.macmillandictionary.com/dict ... tish/until
https://www.diffen.com/difference/Unless_vs_Until

Could you please let me know what is rule of thumb on GMAT about until ?

Thanks
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How many days after the purchase of Product X does its stand 12 Jul 2015, 19:35
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Apologies if this has already been discussed elsewhere, however I wonder how the question would have differed if it was mentioned as (1997 is a "Leap Year") ?

Kindly help :)
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How many days after the purchase of Product X does its stand 23 Sep 2017, 08:04
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Bunuel
How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997 --> warranty period can vary from 29 days (the least possible warranty: from 31st of January to 1st of March) to 89 days (the greatest possible warranty: from 1st of January to 31st of March). Not sufficient.

(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997 --> warranty period can vary from 1 day (the least possible warranty: from 1st of May to 2nd of May) to 30 days (the greatest possible warranty: from 1st of May to 31st of May). Not sufficient.

(1)+(2) Intersection of the warranty periods from (1) and (2) is 29 and 30 days, still two possible answers. Not sufficient.

Answer: E.

Hope it's clear.
Show more

Hi - why are we finding ranges (highest difference in number of days or lowest difference in number of days)

Why are values like 2 weeks or 1 week or 20 days warranty not answer choices potentially
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How many days after the purchase of Product X does its stand 23 Sep 2017, 08:22
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Bunuel
How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997 --> warranty period can vary from 29 days (the least possible warranty: from 31st of January to 1st of March) to 89 days (the greatest possible warranty: from 1st of January to 31st of March). Not sufficient.

(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997 --> warranty period can vary from 1 day (the least possible warranty: from 1st of May to 2nd of May) to 30 days (the greatest possible warranty: from 1st of May to 31st of May). Not sufficient.

(1)+(2) Intersection of the warranty periods from (1) and (2) is 29 and 30 days, still two possible answers. Not sufficient.

Answer: E.

Hope it's clear.

Hi - why are we finding ranges (highest difference in number of days or lowest difference in number of days)

Why are values like 2 weeks or 1 week or 20 days warranty not answer choices potentially
Show more

We want to know the warranty period in days. From (1) it can be anything from 29 days to 89 days. From (2) it can be anything from 1 day to 30 days. When combining it can be 29 or 30 days.

Now, taking the above into consideration what does your question mean?
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How many days after the purchase of Product X does its stand 19 Aug 2018, 03:30
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Stiv
How many days after the purchase of Product X does its standard warranty expire? (1997 is not a leap year.)

(1) When Mark purchased Product X in January 1997, the warranty did not expire until March 1997.
(2) When Santos purchased Product X in May 1997, the warranty expired in May 1997.
Show more

Statement 1:
Minimum number of days:
purchase date = January 31, expiration date = March 1
Here, the expiration date = (28 days of February) + (first day of March) = 29 days after purchase.
Maximum number of days:
purchase date = January 1, expiration date = March 31
Here, the expiration date = (30 days of January after the first day) + (28 days of February) + (31 days of March) = 89 days after purchase.
Implication:
The number of days after purchase can be any integer value between 29 and 89, inclusive.
INSUFFICIENT.

Statement 2:
Minimum number days after purchase:
purchase date = May 1, expiration date = May 2
Here, the expiration date = 1 day after purchase.
Maximum number of days after purchase:
purchase date = May 1, expiration date = May 31
Here, the expiration date = (30 days of May after May 1) = 30 days after purchase.
Implication:
The number of days after purchase can be any integer value between 1 and 30, inclusive.
INSUFFICIENT.

Statements combined:
Statement 1: range = 29 to 89 days, inclusive
Statement 2: range = 1 to 30 days, inclusive
The two ranges overlap such that the number of days after purchase can be 29 or 30.
INSUFFICIENT.

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E
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