Tank E contained 2 times as many guppies as Tank F. When 20% of the guppies in Tank E and 40% of the guppies in Tank F were transferred to Tank G, Tank G had 96 guppies, which was 50% more guppies than before. How many more guppies were there in Tank G than Tank F in the end?

	Tank E	Tank F	Tank G
Before	2 u	1 u	2x0.8 = 1.6 u
Change	- 0.4 u	- 0.4 u	+ 1x0.8 = + 0.8 u
After	1.6 u	0.6 u	3x0.8 = 2.4 u

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

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

50% = ⁵⁰₁₀₀ = ¹₂

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

Total number of guppies transferred from Tank E and Tank F into Tank G
= 0.4 u + 0.4 u
= 0.8 u

2.4 u = 96

1 u = 96 ÷ 2.4 = 40

Number of more guppies in Tank G than Tank F
= 2.4 u - 0.6 u
= 1.8 u
= 1.8 x 40
= 72

Answer(s): 72