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 52¢. How many oranges must Mary put back so that the average price of the pieces of fruit that she keeps is 44¢?
Pick one: A) 1 B) 2 C) 3 D) 4 E) 5
If the average price is 52, then Mary has 6 oranges and 4 apples (a ratio of 3:2).   For the average price to be 44, the ratio should be 1:4.   Mary must put back 5 oranges.   The answer is 5.
<result>E</result>
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 52¢. How many oranges must Mary put back so that the average price of the pieces of fruit that she keeps is 44¢?