A bag contains x blue chips and y red chips. If the probability of selecting a red chip at random is 37, thenxy =
A.711
B.34
C.74
D.43
E.117
我的答案：
A bag contains x blue chips and y red chips. If the probability of selecting a red chip at random is fff\(\frac{3}{7}\)/fff, thenfff\(\frac{x}{y}\)/fff =
