Tank R contained 4 times as many guppies as Tank S. When 40% of the guppies in Tank R and 20% of the guppies in Tank S were transferred to Tank T, Tank T had 360 guppies, which was 25% 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	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 R to Tank T
= 40% x 4 u
= ⁴⁰₁₀₀ x 4 u
= 1.6 u

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

25% = ²⁵₁₀₀ = ¹₄

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
= 1.6 u + 0.2 u
= 1.8 u

9 u = 360

1 u = 360 ÷ 9 = 40

Number of more guppies in Tank T than Tank S
= 9 u - 0.8 u
= 8.2 u
= 8.2 x 40
= 328

Answer(s): 328