Tank W contained 2 times as many guppies as Tank X. When 30% of the guppies in Tank W and 20% of the guppies in Tank X were transferred to Tank Y, Tank Y had 24 guppies, which was 50% more guppies than before. How many more guppies were there in Tank Y than Tank X in the end?

	Tank W	Tank X	Tank Y
Before	2 u	1 u	2x0.8 = 1.6 u
Change	- 0.6 u	- 0.2 u	+ 1x0.8 = + 0.8 u
After	1.4 u	0.8 u	3x0.8 = 2.4 u

Number of guppies that were transferred from Tank W to Tank Y
= 30% x 2 u
= ³⁰₁₀₀ x 2 u
= 0.6 u

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

50% = ⁵⁰₁₀₀ = ¹₂

Some guppies from Tank W and Tank X were transferred to Tank Y.  The total number of guppies transferred from Tank W and Tank X into Tank Y is the same.

Total number of guppies transferred from Tank W and Tank X into Tank Y
= 0.6 u + 0.2 u
= 0.8 u

2.4 u = 24

1 u = 24 ÷ 2.4 = 10

Number of more guppies in Tank Y than Tank X
= 2.4 u - 0.8 u
= 1.6 u
= 1.6 x 10
= 16

Answer(s): 16