Tank E contained 3 times as many guppies as Tank F. When 30% of the guppies in Tank E and 10% of the guppies in Tank F were transferred to Tank G, Tank G had 200 guppies, which was 25% more guppies than before. How many more guppies were there in Tank G than Tank F in the end?

	Tank E	Tank F	Tank G
Before	3 u	1 u	4x1 = 4 u
Change	- 0.9 u	- 0.1 u	+ 1x1 = + 1 u
After	2.1 u	0.9 u	5x1 = 5 u

Number of guppies that were transferred from Tank E to Tank G
= 30% x 3 u
= ³⁰₁₀₀ x 3 u
= 0.9 u

Number of guppies that were transferred from Tank F to Tank G
= 10% x 1 u
= ¹⁰₁₀₀ x 1 u
= 0.1 u

25% = ²⁵₁₀₀ = ¹₄

Some guppies from Tank E and Tank F were transferred to Tank G.  The total number of guppies transferred from Tank E and Tank F into Tank G is the same.

Total number of guppies transferred from Tank E and Tank F into Tank G
= 0.9 u + 0.1 u
= 1 u

5 u = 200

1 u = 200 ÷ 5 = 40

Number of more guppies in Tank G than Tank F
= 5 u - 0.9 u
= 4.1 u
= 4.1 x 40
= 164

Answer(s): 164