Tank A contained 3 times as many guppies as Tank B. When 40% of the guppies in Tank A and 40% of the guppies in Tank B were transferred to Tank C, Tank C had 192 guppies, which was 20% more guppies than before. How many more guppies were there in Tank C than Tank B in the end?

	Tank A	Tank B	Tank C
Before	3 u	1 u	5x1.6 = 8 u
Change	- 1.2 u	- 0.4 u	+ 1x1.6 = + 1.6 u
After	1.8 u	0.6 u	6x1.6 = 9.6 u

Number of guppies that were transferred from Tank A to Tank C
= 40% x 3 u
= ⁴⁰₁₀₀ x 3 u
= 1.2 u

Number of guppies that were transferred from Tank B to Tank C
= 40% x 1 u
= ⁴⁰₁₀₀ x 1 u
= 0.4 u

20% = ²⁰₁₀₀ = ¹₅

Some guppies from Tank A and Tank B were transferred to Tank C.  The total number of guppies transferred from Tank A and Tank B into Tank C is the same.

Total number of guppies transferred from Tank A and Tank B into Tank C
= 1.2 u + 0.4 u
= 1.6 u

9.6 u = 192

1 u = 192 ÷ 9.6 = 20

Number of more guppies in Tank C than Tank B
= 9.6 u - 0.6 u
= 9 u
= 9 x 20
= 180

Answer(s): 180