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In the decimal above, ♣ and x represent single digits. What

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In the decimal above, ♣ and x represent single digits. What [#permalink] New post 28 May 2010, 14:32
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$7.9♣x7

In the decimal above, ♣ and x represent single digits. What is the value of x ?

(1) When the sum is rounded to the nearest cent, its cash value is $7.94.

(2) When the sum is rounded to the nearest tenth of a cent, its cash value is $7.95.
[Reveal] Spoiler: OA

Last edited by Bunuel on 03 Mar 2014, 13:07, edited 2 times in total.
Added the OA.
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 30 May 2010, 03:03
perseverant wrote:
$7.9♣x7

In the decimal above, ♣ and x represent single digits. What is the value of x ?

(1) When the sum is rounded to the nearest cent, its cash value is $7.94.

(2) When the sum is rounded to the nearest tenth of a cent, its cash value is $7.95.

Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
EITHER statement BY ITSELF is sufficient to answer the question.
Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem.

Could someone explain in detail how to solve this? I will post the answer later.

Thanks!


IMO B

$7.9♣x7

In the decimal above, ♣ and x represent single digits. What is the value of x ?

(1) When the sum is rounded to the nearest cent, its cash value is $7.94.
When rounded to the nearest cent,the value is 7.94 which means it could be 7.9417 or 7.9367 etc

(2) When the sum is rounded to the nearest tenth of a cent, its cash value is $7.95.
it is 7.9497 and x =9

as we are here rounding till $7.9♣x and the last 7 will increment x as 7>5 which will in turn increment ♣ by 1
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 30 May 2010, 05:16
You are right! B is the answer, I understand why statement 1 is insufficient, but I still dont understand why statement 2 is sufficient :(
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 30 May 2010, 10:15
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perseverant wrote:
You are right! B is the answer, I understand why statement 1 is insufficient, but I still dont understand why statement 2 is sufficient :(


(2) When the sum is rounded to the nearest tenth of a cent, its cash value is $7.95.

$7.9♣x7, when this is rounded to the nearest of tenth of a cent it should have 7._ _ _ three places of decimal.

so effectively 7.95 is 7.950 and for the $7.9♣x7 to be 7.950 x must be 9 and ♣ must be 4.

$7.9497 -> just round this to nearest tenth of a cent you will get 7.950
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 21 Apr 2011, 22:53
Let us write the number as 7.9ab7
From 2)
This has been rounded to 7.950
In that case if the value of "a" is 5 then b is 0-4. But if the value of "a" is 4 then b is 9. There is no way to determine a single value of b. Hence 2) alone is insufficient.

Pls correct if the reasoning is wrong.

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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 21 Apr 2011, 23:38
What is the meaning of "nearest tenth of a cent" (as given in (2) ) ?
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 21 Apr 2011, 23:44
subhashghosh wrote:
What is the meaning of "nearest tenth of a cent" (as given in (2) ) ?


Nearest cent means "nearest tenth' AND nearest tenth of a cent means 'nearest hundredths'.
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 22 Apr 2011, 00:05
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gmat1220 wrote:
Let us write the number as 7.9ab7
From 2)
This has been rounded to 7.950
In that case if the value of "a" is 5 then b is 0-4. But if the value of "a" is 4 then b is 9. There is no way to determine a single value of b. Hence 2) alone is insufficient.

Pls correct if the reasoning is wrong.

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In the scenario highlighted above, the rounded value would be 7.951 to 7.955 depending on b being 0-4, whereas the stem tells us that value has to be 7.950 which can happen only when a is 4 and b is 9.
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 22 Apr 2011, 00:38
Yup I realized it. Thanks for undeceiving me. For the very first time the OA given by Kaplan is wrong.
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 22 Apr 2011, 02:43
fluke wrote:
subhashghosh wrote:
What is the meaning of "nearest tenth of a cent" (as given in (2) ) ?


Nearest cent means "nearest tenth' AND nearest tenth of a cent means 'nearest hundredths'.


that is what i was looking for
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 22 Apr 2011, 02:47
it can also happen when b is 8.
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 31 Oct 2011, 01:28
kamalkicks wrote:
it can also happen when b is 8.



+1, it can be 6,7 and 8, why only 9??
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 02 Nov 2011, 10:15
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x=4 :?:


I guess what they mean by "cash value" is the exact value only.

If cash value is $7.95 and this is rounded to 3 digits after decimal, the rounded value must be 7.950 i.e. the same as the cash value.

How will you get 7.950 as the value rounded to the thousandth digit?
Only when the number you rounded was 7.9497 (there needs to be a 7 in the ten thousandth position)
When you round this to reduce one digit, you increase the rightmost 9 by one to account for the rightmost 7. When you do this, 49 becomes 50 so you get 7.950.

If the value was 7.9487, rounded to 3 decimal places, it would be 7.949. This is not the same as 7.95
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Re: 9 x7 In the decimal above, and x represent single digits. [#permalink] New post 10 Aug 2013, 07:11
In this question first of all it is very important to understand the terms " rounded to the nearest cent" and "rounded to the nearest tenth of a cent"

Without pre knowledge it is difficult to touch this question, here concept of rounding is not same as general concept of rounding at 10th or 100th place after decimal.

I did some googling to understand this concept :)

Cents represents two digits after decimal such as
2.43 >> 2 dollar 43 cents
2.57 >> 2 dollar 57 cents.

Sum rounded to the nearest cents means rounding at second digit after decimal.
E.g 2.345 = 2.35
E.g 4.553 = 4.55
E.g 5.561 = 5.56

Sum rounded to the nearest tenth of a cents means rounding at digit after cents that is third digit after decimal.
3.34xy round of x as per value of y (here y is 100th place of cent and x is 10th place)
E.g 3.5678 = 3.568 7 become 8
E.g 3.5622 = 3.562 truncated last digit bcz it was less than 5.

Now back to the question.

Statement 2: Rounding to the nearest tenth of the cent is 7.95_ one digit is missing and that should be zero which is not mentioned in question but expected.

So we have 7.950 <--- $7.9♣x7

As 100th digit of the cent is 7 definitely it will add 1 to 10th digit that is x, thus only one digit can yield zero after addition of 1 that is 9.

Thus x = 9 and ♣x should be 49 to have final result as 7.950.
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 22 Nov 2013, 12:03
fluke wrote:
subhashghosh wrote:
What is the meaning of "nearest tenth of a cent" (as given in (2) ) ?


Nearest cent means "nearest tenth' AND nearest tenth of a cent means 'nearest hundredths'.


Yeah I too got confused with the meaning of tenth of a cent.. :(
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Re: In the decimal above, ♣ and x represent single digits... [#permalink] New post 03 Feb 2014, 23:12
So the key here is "cash value" which limits rounding possibilities. Thanks for highlighting it Karishma.


VeritasPrepKarishma wrote:
prekelen wrote:
C
x=4 :?:


I guess what they mean by "cash value" is the exact value only.

If cash value is $7.95 and this is rounded to 3 digits after decimal, the rounded value must be 7.950 i.e. the same as the cash value.

How will you get 7.950 as the value rounded to the thousandth digit?
Only when the number you rounded was 7.9497 (there needs to be a 7 in the ten thousandth position)
When you round this to reduce one digit, you increase the rightmost 9 by one to account for the rightmost 7. When you do this, 49 becomes 50 so you get 7.950.

If the value was 7.9487, rounded to 3 decimal places, it would be 7.949. This is not the same as 7.95

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In the decimal above, x andy represent single digits. What i [#permalink] New post 03 Mar 2014, 12:48
This question is from the KAPLAN quiz bank.

$7.9xy7

In the decimal above, x and y represent single digits. What is the value of y ?

(1) When the sum is rounded to the nearest cent, its cash value is $7.94.

(2) When the sum is rounded to the nearest tenth of a cent, its cash value is $7.95.




Please have a look at the first image below for the 'official' solution.

I'm having my doubts for the following reasons: statement 2 says that when rounding to the nearest tenth of cent, the cash value is 7.95. Since we know the hundredth of a cent is 7, we know that when rounding to the nearest tenth of a cent we must add +1 to y. since the new cash value is 7.95 or 7.950, the only value for y that would make it 0 after rounding is 9. Why isn't this so?

thanks for explaining :)

Max
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Re: In the decimal above, x andy represent single digits. What i [#permalink] New post 03 Mar 2014, 13:07
Expert's post
damamikus wrote:
This question is from the KAPLAN quiz bank.

$7.9xy7

In the decimal above, x and y represent single digits. What is the value of y ?

(1) When the sum is rounded to the nearest cent, its cash value is $7.94.

(2) When the sum is rounded to the nearest tenth of a cent, its cash value is $7.95.




Please have a look at the first image below for the 'official' solution.

I'm having my doubts for the following reasons: statement 2 says that when rounding to the nearest tenth of cent, the cash value is 7.95. Since we know the hundredth of a cent is 7, we know that when rounding to the nearest tenth of a cent we must add +1 to y. since the new cash value is 7.95 or 7.950, the only value for y that would make it 0 after rounding is 9. Why isn't this so?

thanks for explaining :)

Max


Merging similar topics. Please refer to the discussion above and ask if anything remains unclear.
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Re: In the decimal above, ♣ and x represent single digits. What [#permalink] New post 03 Mar 2014, 13:17
So my answer (B) was correct afterall.. Perhaps someone from KAPLAN would care to elaborate on why they would include wrong answers in their 199$ Quiz Bank?! I got really nervous after I read the KAPLAN description because I was convinced I had it right..
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Re: 9 x7 In the decimal above, and x represent single digits. [#permalink] New post 01 Jun 2014, 09:45
PiyushK wrote:
In this question first of all it is very important to understand the terms " rounded to the nearest cent" and "rounded to the nearest tenth of a cent"

Without pre knowledge it is difficult to touch this question, here concept of rounding is not same as general concept of rounding at 10th or 100th place after decimal.

I did some googling to understand this concept :)

Cents represents two digits after decimal such as
2.43 >> 2 dollar 43 cents
2.57 >> 2 dollar 57 cents.

Sum rounded to the nearest cents means rounding at second digit after decimal.
E.g 2.345 = 2.35
E.g 4.553 = 4.55
E.g 5.561 = 5.56

Sum rounded to the nearest tenth of a cents means rounding at digit after cents that is third digit after decimal.
3.34xy round of x as per value of y (here y is 100th place of cent and x is 10th place)
E.g 3.5678 = 3.568 7 become 8
E.g 3.5622 = 3.562 truncated last digit bcz it was less than 5.

Now back to the question.

Statement 2: Rounding to the nearest tenth of the cent is 7.95_ one digit is missing and that should be zero which is not mentioned in question but expected.

So we have 7.950 <--- $7.9♣x7

As 100th digit of the cent is 7 definitely it will add 1 to 10th digit that is x, thus only one digit can yield zero after addition of 1 that is 9.

Thus x = 9 and ♣x should be 49 to have final result as 7.950.


I am trying to go back to statement 1 if it makes sense. So if we say the number is $7.9497 (as per statement 2) then how do we get $7.94 in statement 1? If $7.9497 is rounded to nearest cents then it should be 7.95 also. Shouldn't it? :roll:
Feels like statement 1 and 2 are contradicting each other...
Bunuel please clarify when you get a chance.
Thank you.
Re: 9 x7 In the decimal above, and x represent single digits.   [#permalink] 01 Jun 2014, 09:45
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