Abi and Gabby collected seashells. Abi gave 30% of her seashells to Gabby and as a result, Gabby's seashells increased by 25%. If Abi had 84 seashells left, find the number of seashells Gabby should give to Abi in the end so that both had an equal number of seashells.

	Abi	Gabby	Comparing the change in Gabby'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 Gabby had is repeated.  Make the increase in the number of seashells that Gabby had the same. LCM of 3 and 1 = 3

7 u = 84

1 u = 84 ÷ 7 = 12

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

Number of seashells that Gabby should give to Abi so that both had an equal number of seashells in the end
= 8 u ÷ 2
= 4 u
= 4 x 12
= 48

Answer(s): 48