Esther and Risa collected seashells. Esther gave 60% of her seashells to Risa and as a result, Risa's seashells increased by 20%. If Esther had 8 seashells left, find the number of seashells Risa should give to Esther in the end so that both had an equal number of seashells.

	Esther	Risa	Comparing the change in Risa's seashells
Before	5x1 = 5 u		5x3 = 15u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	2x1 = 2 u		6x3 = 18 u

60% = ⁶⁰₁₀₀ = ³₅
20% = ²⁰₁₀₀ = ¹₅

The increase in the number of seashells that Risa had is repeated.  Make the increase in the number of seashells that Risa had the same. LCM of 3 and 1 = 3

2 u = 8

1 u = 8 ÷ 2 = 4

Number of seashells that Risa had more than Esther in the end
= 18 u - 2 u
= 16 u

Number of seashells that Risa should give to Esther so that both had an equal number of seashells in the end
= 16 u ÷ 2
= 8 u
= 8 x 4
= 32

Answer(s): 32