Tank L contained 4 times as many guppies as Tank M. When 30% of the guppies in Tank L and 40% of the guppies in Tank M were transferred to Tank N, Tank N had 144 guppies, which was 50% more guppies than before. How many more guppies were there in Tank N than Tank M in the end?

	Tank L	Tank M	Tank N
Before	4 u	1 u	2x1.6 = 3.2 u
Change	- 1.2 u	- 0.4 u	+ 1x1.6 = + 1.6 u
After	2.8 u	0.6 u	3x1.6 = 4.8 u

Number of guppies that were transferred from Tank L to Tank N
= 30% x 4 u
= ³⁰₁₀₀ x 4 u
= 1.2 u

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

50% = ⁵⁰₁₀₀ = ¹₂

Some guppies from Tank L and Tank M were transferred to Tank N.  The total number of guppies transferred from Tank L and Tank M into Tank N is the same.

Total number of guppies transferred from Tank L and Tank M into Tank N
= 1.2 u + 0.4 u
= 1.6 u

4.8 u = 144

1 u = 144 ÷ 4.8 = 30

Number of more guppies in Tank N than Tank M
= 4.8 u - 0.6 u
= 4.2 u
= 4.2 x 30
= 126

Answer(s): 126