The ratio of the number of wafers in Container X to the number of wafers in Container Y was 5 : 3. 20% of the wafers in Container X and 0.6 of those in Container Y were strawberry. After transferring the wafers between the 2 containers, the number of matcha wafers in both containers are the same. Likewise, the number of strawberry wafers in both containers are the same. If a total of 198 wafers were moved, how many more wafers were there in Container X than Container Y at first?

Container X		Container Y
5 u		3 u
Strawberry	Matcha	Strawberry	Matcha
1 u	4 u	1.8 u	1.2 u
+ 0.4 u	- 1.4 u	- 0.4 u	+ 1.4 u
1.4 u	2.6 u	1.4 u	2.6 u

Number of strawberry wafers in Container X
= 20% x 5 u
= ²⁰₁₀₀ x 5 u
= 1 u

Number of matcha wafers in Container X
= 5 u - 1 u
= 4 u

Number of strawberry wafers in Container Y
= 0.6 x 3 u
= 1.8 u

Number of matcha wafers in Container Y
= 3 u - 1.8 u
= 1.2 u

Number of strawberry wafers in each container in the end
= (1 u + 1.8 u) ÷ 2
= 2.8 u ÷ 2
= 1.4 u

Number of matcha wafers in each container in the end
= (4 u + 1.2 u) ÷ 2
= 5.2 u ÷ 2
= 2.6 u

Number of wafers moved
= 0.4 u + 1.4 u
= 1.8 u

1.8 u = 198

1 u = 198 ÷ 1.8 = 110

Number of more wafers in Container X than Container Y at first
= 5 u - 3 u
= 2 u
= 2 x 110
= 220

Answer(s): 220