The ratio of the number of puffs in Container A to the number of puffs in Container B was 9 : 5. 40% of the puffs in Container A and 0.8 of those in Container B were butter cream. After transferring the puffs between the 2 containers, the number of chocolate puffs in both containers are the same. Likewise, the number of butter cream puffs in both containers are the same. If a total of 192 puffs were moved, how many more puffs were there in Container A than Container B at first?

Container A		Container B
9 u		5 u
Butter Cream	Chocolate	Butter Cream	Chocolate
3.6 u	5.4 u	4 u	1 u
+ 0.2 u	- 2.2 u	- 0.2 u	+ 2.2 u
3.8 u	3.2 u	3.8 u	3.2 u

Number of butter cream puffs in Container A
= 40% x 9 u
= ⁴⁰₁₀₀ x 9 u
= 3.6 u

Number of chocolate puffs in Container A
= 9 u - 3.6 u
= 5.4 u

Number of butter cream puffs in Container B
= 0.8 x 5 u
= 4 u

Number of chocolate puffs in Container B
= 5 u - 4 u
= 1 u

Number of butter cream puffs in each container in the end
= (3.6 u + 4 u) ÷ 2
= 7.6 u ÷ 2
= 3.8 u

Number of chocolate puffs in each container in the end
= (5.4 u + 1 u) ÷ 2
= 6.4 u ÷ 2
= 3.2 u

Number of puffs moved
= 0.2 u + 2.2 u
= 2.4 u

2.4 u = 192

1 u = 192 ÷ 2.4 = 80

Number of more puffs in Container A than Container B at first
= 9 u - 5 u
= 4 u
= 4 x 80
= 320

Answer(s): 320