Tank U contained 4 times as many guppies as Tank V. When 30% of the guppies in Tank U and 40% of the guppies in Tank V were transferred to Tank W, Tank W had 48 guppies, which was 50% more guppies than before. How many less guppies were there in Tank V than Tank U in the end?

	Tank U	Tank V	Tank W
Before	4 u	1 u	2x1.6 = 3.2 u
Change	- 1.2 u	- 0.4 u	+ 1x1.6 = + 1.6 u
After	2.8 u	0.6 u	3x1.6 = 4.8 u

Number of guppies that were transferred from Tank U to Tank W
= 30% x 4 u
= ³⁰₁₀₀ x 4 u
= 1.2 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
= 1.2 u + 0.4 u
= 1.6 u

4.8 u = 48

1 u = 48 ÷ 4.8 = 10

Number of less guppies in Tank V than Tank U
= 2.8 u - 0.6 u
= 2.2 u
= 2.2 x 10
= 22

Answer(s): 22