Yoko and Jean collected seashells. Yoko gave 30% of her seashells to Jean and as a result, Jean's seashells increased by 10%. If Yoko had 77 seashells left, find the number of seashells Jean should give to Yoko in the end so that both had an equal number of seashells.

	Yoko	Jean	Comparing the change in Jean's seashells
Before	10x1 = 10 u		10x3 = 30u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	7x1 = 7 u		11x3 = 33 u

30% = ³⁰₁₀₀ = ³₁₀
10% = ¹⁰₁₀₀ = ¹₁₀

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

7 u = 77

1 u = 77 ÷ 7 = 11

Number of seashells that Jean had more than Yoko in the end
= 33 u - 7 u
= 26 u

Number of seashells that Jean should give to Yoko so that both had an equal number of seashells in the end
= 26 u ÷ 2
= 13 u
= 13 x 11
= 143

Answer(s): 143