Tank N contained 4 times as many guppies as Tank P. When 40% of the guppies in Tank N and 30% of the guppies in Tank P were transferred to Tank Q, Tank Q had 380 guppies, which was 25% more guppies than before. How many less guppies were there in Tank P than Tank N in the end?

	Tank N	Tank P	Tank Q
Before	4 u	1 u	4x1.9 = 7.6 u
Change	- 1.6 u	- 0.3 u	+ 1x1.9 = + 1.9 u
After	2.4 u	0.7 u	5x1.9 = 9.5 u

Number of guppies that were transferred from Tank N to Tank Q
= 40% x 4 u
= ⁴⁰₁₀₀ x 4 u
= 1.6 u

Number of guppies that were transferred from Tank P to Tank Q
= 30% x 1 u
= ³⁰₁₀₀ x 1 u
= 0.3 u

25% = ²⁵₁₀₀ = ¹₄

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

Total number of guppies transferred from Tank N and Tank P into Tank Q
= 1.6 u + 0.3 u
= 1.9 u

9.5 u = 380

1 u = 380 ÷ 9.5 = 40

Number of less guppies in Tank P than Tank N
= 2.4 u - 0.7 u
= 1.7 u
= 1.7 x 40
= 68

Answer(s): 68