GWD-30-3 涛涛 求解

赵小团

Q3:
At a certain food stand, the price of each apple is ¢ 40 and the price of each orange is ¢ 60.  Mary selects a total of 10 apples and oranges from the food stand, and the average (arithmetic mean) price of the 10 pieces of fruit is ¢ 56.  How many oranges must Mary put back so that the average price of the pieces of fruit that she keeps is ¢ 52?

A.    1
B.    2
C.    3
D.    4
E.    5

Answer: E

kazemi

E.    5

苹果数量不变，但买的总数不是10个了...