Tank T contained 4 times as many guppies as Tank U. When 40% of the guppies in Tank T and 20% of the guppies in Tank U were transferred to Tank V, Tank V had 180 guppies, which was 25% more guppies than before. How many more guppies were there in Tank V than Tank U in the end?

	Tank T	Tank U	Tank V
Before	4 u	1 u	4x1.8 = 7.2 u
Change	- 1.6 u	- 0.2 u	+ 1x1.8 = + 1.8 u
After	2.4 u	0.8 u	5x1.8 = 9 u

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

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

25% = ²⁵₁₀₀ = ¹₄

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

Total number of guppies transferred from Tank T and Tank U into Tank V
= 1.6 u + 0.2 u
= 1.8 u

9 u = 180

1 u = 180 ÷ 9 = 20

Number of more guppies in Tank V than Tank U
= 9 u - 0.8 u
= 8.2 u
= 8.2 x 20
= 164

Answer(s): 164