Vanessa and Shiyun collected seashells. Vanessa gave 30% of her seashells to Shiyun and as a result, Shiyun's seashells increased by 25%. If Vanessa had 56 seashells left, find the number of seashells Shiyun should give to Vanessa in the end so that both had an equal number of seashells.

	Vanessa	Shiyun	Comparing the change in Shiyun's seashells
Before	10x1 = 10 u		4x3 = 12u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	7x1 = 7 u		5x3 = 15 u

30% = ³⁰₁₀₀ = ³₁₀
25% = ²⁵₁₀₀ = ¹₄

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

7 u = 56

1 u = 56 ÷ 7 = 8

Number of seashells that Shiyun had more than Vanessa in the end
= 15 u - 7 u
= 8 u

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

Answer(s): 32