Tank G contained 3 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 150 guppies, which was 25% more guppies than before. How many less guppies were there in Tank H than Tank G in the end?

	Tank G	Tank H	Tank J
Before	3 u	1 u	4x1 = 4 u
Change	- 0.6 u	- 0.4 u	+ 1x1 = + 1 u
After	2.4 u	0.6 u	5x1 = 5 u

Number of guppies that were transferred from Tank G to Tank J
= 20% x 3 u
= ²⁰₁₀₀ x 3 u
= 0.6 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
= 0.6 u + 0.4 u
= 1 u

5 u = 150

1 u = 150 ÷ 5 = 30

Number of less guppies in Tank H than Tank G
= 2.4 u - 0.6 u
= 1.8 u
= 1.8 x 30
= 54

Answer(s): 54