Ivory and Abi collected erasers. Ivory gave 30% of her erasers to Abi and as a result, Abi's erasers increased by 10%. If Ivory had 56 erasers left, find the number of erasers Abi should give to Ivory in the end so that both had an equal number of erasers.

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

7 u = 56

1 u = 56 ÷ 7 = 8

Number of erasers that Abi had more than Ivory in the end
= 33 u - 7 u
= 26 u

Number of erasers that Abi should give to Ivory so that both had an equal number of erasers in the end
= 26 u ÷ 2
= 13 u
= 13 x 8
= 104

Answer(s): 104