Tank E contained 4 times as many guppies as Tank F. When 50% of the guppies in Tank E and 40% of the guppies in Tank F were transferred to Tank G, Tank G had 288 guppies, which was 50% more guppies than before. How many less guppies were there in Tank F than Tank E in the end?

	Tank E	Tank F	Tank G
Before	4 u	1 u	2x2.4 = 4.8 u
Change	- 2 u	- 0.4 u	+ 1x2.4 = + 2.4 u
After	2 u	0.6 u	3x2.4 = 7.2 u

Number of guppies that were transferred from Tank E to Tank G
= 50% x 4 u
= ⁵⁰₁₀₀ x 4 u
= 2 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
= 2 u + 0.4 u
= 2.4 u

7.2 u = 288

1 u = 288 ÷ 7.2 = 40

Number of less guppies in Tank F than Tank E
= 2 u - 0.6 u
= 1.4 u
= 1.4 x 40
= 56

Answer(s): 56