The ratio of the number of puffs in Container A to the number of puffs in Container B was 7 : 5. 40% of the puffs in Container A and 0.6 of those in Container B were matcha. After transferring the puffs between the 2 boxes, the number of chocolate puffs in both boxes are the same. Likewise, the number of matcha puffs in both boxes are the same. If a total of 216 puffs were moved, how many more puffs were there in Container A than Container B at first?

Container A		Container B
7 u		5 u
Matcha	Chocolate	Matcha	Chocolate
2.8 u	4.2 u	3 u	2 u
+ 0.1 u	- 1.1 u	- 0.1 u	+ 1.1 u
2.9 u	3.1 u	2.9 u	3.1 u

Number of matcha puffs in Container A
= 40% x 7 u
= ⁴⁰₁₀₀ x 7 u
= 2.8 u

Number of chocolate puffs in Container A
= 7 u - 2.8 u
= 4.2 u

Number of matcha puffs in Container B
= 0.6 x 5 u
= 3 u

Number of chocolate puffs in Container B
= 5 u - 3 u
= 2 u

Number of matcha puffs in each box in the end
= (2.8 u + 3 u) ÷ 2
= 5.8 u ÷ 2
= 2.9 u

Number of chocolate puffs in each box in the end
= (4.2 u + 2 u) ÷ 2
= 6.2 u ÷ 2
= 3.1 u

Number of puffs moved
= 0.1 u + 1.1 u
= 1.2 u

1.2 u = 216

1 u = 216 ÷ 1.2 = 180

Number of more puffs in Container A than Container B at first
= 7 u - 5 u
= 2 u
= 2 x 180
= 360

Answer(s): 360