Tank F contained 4 times as many guppies as Tank G. When 40% of the guppies in Tank F and 20% of the guppies in Tank G were transferred to Tank H, Tank H had 108 guppies, which was 50% more guppies than before. How many less guppies were there in Tank G than Tank F in the end?

	Tank F	Tank G	Tank H
Before	4 u	1 u	2x1.8 = 3.6 u
Change	- 1.6 u	- 0.2 u	+ 1x1.8 = + 1.8 u
After	2.4 u	0.8 u	3x1.8 = 5.4 u

Number of guppies that were transferred from Tank F to Tank H
= 40% x 4 u
= ⁴⁰₁₀₀ x 4 u
= 1.6 u

Number of guppies that were transferred from Tank G to Tank H
= 20% x 1 u
= ²⁰₁₀₀ x 1 u
= 0.2 u

50% = ⁵⁰₁₀₀ = ¹₂

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

Total number of guppies transferred from Tank F and Tank G into Tank H
= 1.6 u + 0.2 u
= 1.8 u

5.4 u = 108

1 u = 108 ÷ 5.4 = 20

Number of less guppies in Tank G than Tank F
= 2.4 u - 0.8 u
= 1.6 u
= 1.6 x 20
= 32

Answer(s): 32