Winnie and Elyse collected seashells. Winnie gave 25% of her seashells to Elyse and as a result, Elyse's seashells increased by 30%. If Winnie had 63 seashells left, find the number of seashells Elyse should give to Winnie in the end so that both had an equal number of seashells.

	Winnie	Elyse	Comparing the change in Elyse's seashells
Before	4x3 = 12 u		10x1 = 10u
Change	- 1x3 = - 3 u	+ 1x3 = + 3 u	+ 3x1 = + 3 u
After	3x3 = 9 u		13x1 = 13 u

25% = ²⁵₁₀₀ = ¹₄
30% = ³⁰₁₀₀ = ³₁₀

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

9 u = 63

1 u = 63 ÷ 9 = 7

Number of seashells that Elyse had more than Winnie in the end
= 13 u - 9 u
= 4 u

Number of seashells that Elyse should give to Winnie so that both had an equal number of seashells in the end
= 4 u ÷ 2
= 2 u
= 2 x 7
= 14

Answer(s): 14