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When the integer n is divided by 20, the remainder is 15. Which of the

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When the integer n is divided by 20, the remainder is 15. Which of the  [#permalink]

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When the integer n is divided by 20, the remainder is 15. Which of the following must be a divisor of n ?

A. 3
B. 5
C. 6
D. 7
E. 10
Spoiler: OA

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Re: When the integer n is divided by 20, the remainder is 15. Which of the  [#permalink]

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New post 27 Nov 2018, 05:48
Bunuel wrote:
When the integer n is divided by 20, the remainder is 15. Which of the following must be a divisor of n ?

A. 3
B. 5
C. 6
D. 7
E. 10



n/ 20 = q + 15

n = 20q + 15

n = 5( 4q + 3)

Therefore, n must be divisible by 5.

The best answer is B.
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Re: When the integer n is divided by 20, the remainder is 15. Which of the  [#permalink]

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New post 27 Nov 2018, 10:38
Bunuel wrote:
When the integer n is divided by 20, the remainder is 15. Which of the following must be a divisor of n ?

A. 3
B. 5
C. 6
D. 7
E. 10



n= 20*q+ 15
= 5( 4q+3)

must be a divisor of 5 IMO B
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Re: When the integer n is divided by 20, the remainder is 15. Which of the   [#permalink] 27 Nov 2018, 10:38
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