VeritasPrepKarishma wrote:
AbdurRakib wrote:
If x and y are positive integers such that y is a multiple of 5 and 3x + 4y = 200, then x must be a multiple of which of the following?
A)3
B)6
C)7
D)8
E)10
OG 2017 New Question
A)3
B)6
C)7
D)8
E)10
OG 2017 New Question
If y is a multiple of 5, 4y must be a multiple of 5 too.
3x = 200 - 4y = Multiple of 5 - Multiple of 5 = Multiple of 5
Since 3 is not a multiple of 5, x MUST be a multiple of 5.
Also, 4y is even. So 3x = Even - Even = Even
Since 3 is not even, x must be even.
Hence x must be a multiple
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