Tank L contained 3 times as many guppies as Tank M. When 50% of the guppies in Tank L and 10% of the guppies in Tank M were transferred to Tank N, Tank N had 192 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	3 u	1 u	2x1.6 = 3.2 u
Change	- 1.5 u	- 0.1 u	+ 1x1.6 = + 1.6 u
After	1.5 u	0.9 u	3x1.6 = 4.8 u

Number of guppies that were transferred from Tank L to Tank N
= 50% x 3 u
= ⁵⁰₁₀₀ x 3 u
= 1.5 u

Number of guppies that were transferred from Tank M to Tank N
= 10% x 1 u
= ¹⁰₁₀₀ x 1 u
= 0.1 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
= 1.5 u + 0.1 u
= 1.6 u

4.8 u = 192

1 u = 192 ÷ 4.8 = 40

Number of more guppies in Tank N than Tank M
= 4.8 u - 0.9 u
= 3.9 u
= 3.9 x 40
= 156

Answer(s): 156