Tank G contained 2 times as many guppies as Tank H. When 20% of the guppies in Tank G and 40% of the guppies in Tank H were transferred to Tank J, Tank J had 160 guppies, which was 25% more guppies than before. How many more guppies were there in Tank J than Tank H in the end?

	Tank G	Tank H	Tank J
Before	2 u	1 u	4x0.8 = 3.2 u
Change	- 0.4 u	- 0.4 u	+ 1x0.8 = + 0.8 u
After	1.6 u	0.6 u	5x0.8 = 4 u

Number of guppies that were transferred from Tank G to Tank J
= 20% x 2 u
= ²⁰₁₀₀ x 2 u
= 0.4 u

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

25% = ²⁵₁₀₀ = ¹₄

Some guppies from Tank G and Tank H were transferred to Tank J.  The total number of guppies transferred from Tank G and Tank H into Tank J is the same.

Total number of guppies transferred from Tank G and Tank H into Tank J
= 0.4 u + 0.4 u
= 0.8 u

4 u = 160

1 u = 160 ÷ 4 = 40

Number of more guppies in Tank J than Tank H
= 4 u - 0.6 u
= 3.4 u
= 3.4 x 40
= 136

Answer(s): 136