Can any NN help me with this problem? Thanks

beunique · 发表于 2011-8-26 10:17:55

the problem is:
Q26:

If positive integer x is a multiple of 6 and positive integer y is a multiple of 14, is xy a multiple of 105?

(1)x is a multiple of 9.

(2) y is a multiple of 25.

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.

wyw1018 · 发表于 2011-8-26 10:30:11

KatherineNancy · 发表于 2011-8-26 11:08:35

105的因数含5 3 7 b 的25含5 6 和14 含3 7

whwing · 发表于 2011-8-26 11:15:29

105=3*5*7
xy=6*14*a=4*3*7*a
So,if either x or y is a multiple of 5, then xy will be a multiple of 105.
Answer is b.

Can any NN help me with this problem? Thanks

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