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If r is the remainder when integer n is divided by 7, what is the valu

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If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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Tough and Tricky questions: Remainders.



If r is the remainder when integer n is divided by 7, what is the value of r?

(1) When n is divided by 21, the remainder is an odd number
(2) When n is divided by 28, the remainder is 3
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Re: If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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Bunuel wrote:

Tough and Tricky questions: Remainders.



If r is the remainder when integer n is divided by 7, what is the value of r?

(1) When n is divided by 21, the remainder is an odd number
(2) When n is divided by 28, the remainder is 3


solution: From #1, if n = 5, remainder is 5 and is odd.
if n = 7, remainder is 7 and is odd.
However, remainder when n(5 or 7) is divided by 7 is different. Hence not sufficient
From #2, n=3, or 31, or 59 etc, remainder is 3,
Even when the above numbers are divided by 7, the remainder is still 3

Answer should be B

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Re: If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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New post 04 Sep 2015, 06:10
we are given n/7 = k + r (where "k" in an integer)

Stmt 1: n/21 = m + o (where "m" is an integer and "o" is odd remainder)
=> n = 21m +21o
=> n/7 = 3m + 3o (this does not gives a clear value for the remainder when n is divided by 7)

Stmt 2: n/28 = t + 3 (where "t" is an integer)
=> n = 28t + 28*3
=> n/7 = 4t + 4*3 = 4t + 12 = (4t + 7) + 5
=> the remainder when n id divided by 7 is 5 or r = 5

Since Stmt 2 is sufficient to get the answer, hence the answer would be B.

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Re: If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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New post 07 Aug 2016, 06:24
hunterdonald wrote:
Bunuel wrote:

Tough and Tricky questions: Remainders.



If r is the remainder when integer n is divided by 7, what is the value of r?

(1) When n is divided by 21, the remainder is an odd number
(2) When n is divided by 28, the remainder is 3


solution: From #1, if n = 5, remainder is 5 and is odd.
if n = 7, remainder is 7 and is odd.
However, remainder when n(5 or 7) is divided by 7 is different. Hence not sufficient
From #2, n=3, or 31, or 59 etc, remainder is 3,
Even when the above numbers are divided by 7, the remainder is still 3

Answer should be B



Can't n b 12 in the second case?

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Re: If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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New post 07 Aug 2016, 06:29
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Amit0507 wrote:
hunterdonald wrote:
Bunuel wrote:

Tough and Tricky questions: Remainders.



If r is the remainder when integer n is divided by 7, what is the value of r?

(1) When n is divided by 21, the remainder is an odd number
(2) When n is divided by 28, the remainder is 3


solution: From #1, if n = 5, remainder is 5 and is odd.
if n = 7, remainder is 7 and is odd.
However, remainder when n(5 or 7) is divided by 7 is different. Hence not sufficient
From #2, n=3, or 31, or 59 etc, remainder is 3,
Even when the above numbers are divided by 7, the remainder is still 3

Answer should be B



Can't n b 12 in the second case?


In the 2nd case, we have the equation of the form n=28k+3.

Put the value of k=0,1,2,3,etc.. you will get n =3,31,59,..etc.

Hence, n can never be 12
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Re: If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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Quote:
If r is the remainder when integer n is divided by 7, what is the value of r?

(1) When n is divided by 21, the remainder is an odd number
(2) When n is divided by 28, the remainder is 3


\(\frac{n}{7} = q + r\)

(1) \(\frac{n}{21}\) = quotient + Some odd value

Minimum value of n could be 22 , 24 , 26 -- Not sufficient

(2) \(\frac{n}{28}\) = quotient + 3

Minimum value of n will be 31 that will satisfy above. So r = 3. --Sufficient

Ans. B
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Re: If r is the remainder when integer n is divided by 7, what is the valu [#permalink]

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Re: If r is the remainder when integer n is divided by 7, what is the valu   [#permalink] 10 Dec 2017, 23:28
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