Tank R contained 3 times as many guppies as Tank S. When 40% of the guppies in Tank R and 40% of the guppies in Tank S were transferred to Tank T, Tank T had 96 guppies, which was 50% more guppies than before. How many more guppies were there in Tank T than Tank S in the end?

	Tank R	Tank S	Tank T
Before	3 u	1 u	2x1.6 = 3.2 u
Change	- 1.2 u	- 0.4 u	+ 1x1.6 = + 1.6 u
After	1.8 u	0.6 u	3x1.6 = 4.8 u

Number of guppies that were transferred from Tank R to Tank T
= 40% x 3 u
= ⁴⁰₁₀₀ x 3 u
= 1.2 u

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

50% = ⁵⁰₁₀₀ = ¹₂

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

Total number of guppies transferred from Tank R and Tank S into Tank T
= 1.2 u + 0.4 u
= 1.6 u

4.8 u = 96

1 u = 96 ÷ 4.8 = 20

Number of more guppies in Tank T than Tank S
= 4.8 u - 0.6 u
= 4.2 u
= 4.2 x 20
= 84

Answer(s): 84