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If the remainder is 13 when the integer n is divided by 26

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by BTGModeratorVI » Fri Mar 06, 2020 5:47 pm

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If the remainder is 13 when the integer n is divided by 26, what is the remainder when 2n is divided by 13?

A. 0
B. 2
C. 3.25
D. 6.5
E. 13

Answer: A
Source: GMAT paper tests
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Re: If the remainder is 13 when the integer n is divided by 26

by Brent@GMATPrepNow » Mon Mar 09, 2020 6:08 am
BTGModeratorVI wrote: ↑
Fri Mar 06, 2020 5:47 pm
 If the remainder is 13 when the integer n is divided by 26, what is the remainder when 2n is divided by 13?

A. 0
B. 2
C. 3.25
D. 6.5
E. 13

Answer: A
Source: GMAT paper tests
----ASIDE----------------------
When it comes to remainders, we have a nice rule that says:
If N divided by D leaves remainder R, then the possible values of N are R, R+D, R+2D, R+3D,. . . etc.
For example, if k divided by 5 leaves a remainder of 1, then the possible values of k are: 1, 1+5, 1+(2)(5), 1+(3)(5), 1+(4)(5), . . . etc.
-------------------------------

GIVEN: When n is divided by 26, the remainder is 13
So, some possibles value of n are: 13, 39, 65, 91, ...etc
We can use any of these possible n-values to answer the question.

GIVEN: What is the remainder when 2n is divided by 13?
If n = 13, then 2n = 2(13) = 26, and 26 divided by 26 leaves a remainder of 0

Answer: A

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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Re: If the remainder is 13 when the integer n is divided by 26

by Scott@TargetTestPrep » Sat Mar 14, 2020 10:00 am
BTGModeratorVI wrote: ↑
Fri Mar 06, 2020 5:47 pm
 If the remainder is 13 when the integer n is divided by 26, what is the remainder when 2n is divided by 13?

A. 0
B. 2
C. 3.25
D. 6.5
E. 13

Answer: A
Source: GMAT paper tests
We can let n = 13 since 13/26 = 0 remainder 13. Thus, 2n = 26 and 26/13 = 2 remainder 0.

Answer: A

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