If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?
1)5
2)5(x - y)
3)20x
4)20y
5)35x
1)5
2)5(x - y)
3)20x
4)20y
5)35x
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Manhattan Gmat question
Source: Beat The GMAT — Problem Solving |
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thephoenix
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nisha.menon294 wrote:If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?
1)5
2)5(x - y)
3)20x
4)20y
5)35x
1) possible when x=1 and y=1
2) possible when x=3 and y =2
4) Possible when x=20 and y=35
5) Possible when x=20 and y =35
So by elimination, I come to answer 3.
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