[問題]GWD29-4

[amyliang]

Q4:
If xy = 165, where x and y are positive integers and x > y, what is the least possible value of x – y ?

A. 2
B. 4
C. 8
D. 15
E. 28

ans:B

why? can someone explain to me how to do this question? thank you

[christinehsu]

165= 3*5*11
你要得x-y的最小值，所以儘可能的將X與Y的值湊的越接近越好。
所以x= 15=3*5, Y=11

不好意思，解釋的不清楚，不知道，這樣你可以了解嗎?

[amyliang]

Thank you for explaining the quesiton. I totally understood.