Tank G contained 3 times as many guppies as Tank H. When 30% of the guppies in Tank G and 30% of the guppies in Tank H were transferred to Tank J, Tank J had 180 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	3 u	1 u	4x1.2 = 4.8 u
Change	- 0.9 u	- 0.3 u	+ 1x1.2 = + 1.2 u
After	2.1 u	0.7 u	5x1.2 = 6 u

Number of guppies that were transferred from Tank G to Tank J
= 30% x 3 u
= ³⁰₁₀₀ x 3 u
= 0.9 u

Number of guppies that were transferred from Tank H to Tank J
= 30% x 1 u
= ³⁰₁₀₀ x 1 u
= 0.3 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
= 0.9 u + 0.3 u
= 1.2 u

6 u = 180

1 u = 180 ÷ 6 = 30

Number of more guppies in Tank J than Tank H
= 6 u - 0.7 u
= 5.3 u
= 5.3 x 30
= 159

Answer(s): 159