Q8:
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
Why the key is E. I think it should be B.
(8-2)=6 (6x56-2x40)/(2+6)=52.
(560-60x)=(10-X)52(X代表减少的数量)
X=5。像这类题目,你自己多算一遍,就明白了。关键是细心。
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