The ratio of the number of wafers in Container E to the number of wafers in Container F was 9 : 5. 20% of the wafers in Container E and 0.6 of those in Container F were peach. After transferring the wafers between the 2 boxes, the number of cherry wafers in both boxes are the same. Likewise, the number of peach wafers in both boxes are the same. If a total of 240 wafers were moved, how many more wafers were there in Container E than Container F at first?

Container E		Container F
9 u		5 u
Peach	Cherry	Peach	Cherry
1.8 u	7.2 u	3 u	2 u
+ 0.6 u	- 2.6 u	- 0.6 u	+ 2.6 u
2.4 u	4.6 u	2.4 u	4.6 u

Number of peach wafers in Container E
= 20% x 9 u
= ²⁰₁₀₀ x 9 u
= 1.8 u

Number of cherry wafers in Container E
= 9 u - 1.8 u
= 7.2 u

Number of peach wafers in Container F
= 0.6 x 5 u
= 3 u

Number of cherry wafers in Container F
= 5 u - 3 u
= 2 u

Number of peach wafers in each box in the end
= (1.8 u + 3 u) ÷ 2
= 4.8 u ÷ 2
= 2.4 u

Number of cherry wafers in each box in the end
= (7.2 u + 2 u) ÷ 2
= 9.2 u ÷ 2
= 4.6 u

Number of wafers moved
= 0.6 u + 2.6 u
= 3.2 u

3.2 u = 240

1 u = 240 ÷ 3.2 = 75

Number of more wafers in Container E than Container F at first
= 9 u - 5 u
= 4 u
= 4 x 75
= 300

Answer(s): 300