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Re: If r is the remainder when integer n is divided by 7, what is the valu
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27 Oct 2014, 09:36

1

3

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

Re: If r is the remainder when integer n is divided by 7, what is the valu
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04 Sep 2015, 07:10

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.

Re: If r is the remainder when integer n is divided by 7, what is the valu
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07 Aug 2016, 07:24

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

Re: If r is the remainder when integer n is divided by 7, what is the valu
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07 Aug 2016, 07:29

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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.

Re: If r is the remainder when integer n is divided by 7, what is the valu
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20 Apr 2018, 07:36

Top Contributor

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

We can use a variety of divisibility rules to solve this, or we can list possible values of n based on the statements. The rule for listing possible values of n is as follows: If, when N is divided by D, the remainder is R, then the possible values of N include: R, R+D, R+2D, R+3D,. . .

Target question:What is the value of r?

Statement 1: When n is divided by 21, the remainder is an odd number. There are several possible values of n that satisfy this condition. Here are two: Case a: n = 1 (since 1 divided by 21 leaves remainder 1, which is odd). Here, r = 1 Case b: n = 3 (since 3 divided by 21 leaves remainder 3, which is odd). Here, r = 3 Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: When n is divided by 28, the remainder is 3 Possible values of n: 3, 31, 59, 87, . . . We can see that for all possible values of n, the remainder is always 3 when n is divided by 7 Since we can answer the target question with certainty, statement 2 is SUFFICIENT

Re: If r is the remainder when integer n is divided by 7, what is the valu
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26 Jun 2018, 11:53

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

1) When n is divided by 21, the remainder is an odd number.

when n = 1 , r = 1 when n = 3 , r = 3 NOT SUFF.

2). When n is divided by 28, the remainder is 3 it could be n=3, 31, 59, 87, . . . the remainder is always 3 when n is divided by 7 2 is SUFF.
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Re: If r is the remainder when integer n is divided by 7, what is the valu &nbs
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26 Jun 2018, 11:53