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# When positive integer n is divided by 3, the remainder is 2;

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When positive integer n is divided by 3, the remainder is 2; [#permalink]

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29 Jul 2006, 23:01
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When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3. What is the remainder when the product nt is divided by 15?

1) n-2 is divisible by 5

2) t is divisible by 3

(A) Statement (1) alone is sufficient, but statement (2) alone is not sufficient.
(B) Statement (2) alone is sufficient, but statement (1) alone is not sufficient.
(C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
(D) Each statement ALONE is sufficient.
(E) Statements (1) and (2) TOGETHER are NOT sufficient
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Re: DS: Gmat prep [#permalink]

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29 Jul 2006, 23:19
zoom612 wrote:
When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3. What is the remainder when the product nt is divided by 15?

1) n-2 is divisible by 5

2) t is divisible by 3

C must be it!

Given
n = 3k+2 and t=5l+3

S1. n-2 = 5m => n = 5m+2
Thus, n = 15q+2 insufficient.

S2. t = 3m
Thus, t= 15Q+3 insufficient.

Combine S1 and S2
nt = (15q+2)(15Q+3)
remainder is 2*3 = 6
sufficient
_________________

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Re: DS: Gmat prep   [#permalink] 29 Jul 2006, 23:19
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# When positive integer n is divided by 3, the remainder is 2;

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