The contents of a certain box consist of 80 apples and 30 oranges. How many oranges must be added to the box so that exactly 50% of the pieces of fruit in the box will be apples?
Pick
A) 45
B) 50
C) 55
D) 60
E) 65
apple = (apple + orange + x)*0.5   80 = (30 + 80 + x)*0.5   x = 50   Answer: 50
<result>B</result>
The contents of a certain box consist of 80 apples and 30 oranges. How many oranges must be added to the box so that exactly 50% of the pieces of fruit in the box will be apples?