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

	Tank U	Tank V	Tank W
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 U to Tank W
= 20% x 2 u
= ²⁰₁₀₀ x 2 u
= 0.4 u

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

50% = ⁵⁰₁₀₀ = ¹₂

Some guppies from Tank U and Tank V were transferred to Tank W.  The total number of guppies transferred from Tank U and Tank V into Tank W is the same.

Total number of guppies transferred from Tank U and Tank V into Tank W
= 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 W than Tank V
= 2.4 u - 0.6 u
= 1.8 u
= 1.8 x 40
= 72

Answer(s): 72