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x, y, a, and b are positive integers

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by melguy » Sun Nov 13, 2016 9:28 pm
Please help me with this question

x, y, a, and b are positive integers. When x is divided by y, the remainder is 6. When a is divided by b, the remainder is 9. Which of the following is NOT a possible value for y + b?

24
21
20
17
15

I also wanted to confirm what is the minimum values for x,y,a,b (if I am not mistaken division by zero is undefined?)? Also, please let me know why other options are incorrect.

Thanks
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by Brent@GMATPrepNow » Sun Nov 13, 2016 9:53 pm
HINT: When positive integer N is divided by positive integer D, the remainder R is such that 0 < R < D
For example, if we divide some positive integer by 7, the remainder will be 6, 5, 4, 3, 2, 1, or 0
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by melguy » Sun Nov 13, 2016 11:14 pm
Thanks for your help Brent!

I think the value of minimum value of y+b will be 17.
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by Brent@GMATPrepNow » Sun Nov 13, 2016 11:26 pm
melguy wrote:Thanks for your help Brent!

I think the value of minimum value of y+b will be 17.
BINGO!
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