Farmer Xiao Li went to the farmers market to sell fruits,Apples, pears, oranges, and peaches each have a box,three boxes of apples, pears and oranges, with an average of 51 per box;Three boxes of pears, oranges, and peaches, with an average of 47 per box; Two boxes of apples and peaches, with an average of 43 per box.
How many apples are there?
53