[求助]gwd 3-9

yuqinggong

Q9

If 5x = 2y and xy ≠ 0, then is what percent of y?

A. 2%

B. 4%

C. 10%

D. 40%

E. 50%

Answer: D

Can anyone solve this for me? Is the quesiton compete? I don't understand what it really mean~~~

dreadpower

是说x是y的百分之几, 因为5x = 2y, x/y = 2/5, 所以是40%