Victoria and Winnie collected erasers. Victoria gave 60% of her erasers to Winnie and as a result, Winnie's erasers increased by 20%. If Victoria had 10 erasers left, find the number of erasers Winnie should give to Victoria in the end so that both had an equal number of erasers.

	Victoria	Winnie	Comparing the change in Winnie's erasers
Before	5x1 = 5 u		5x3 = 15u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	2x1 = 2 u		6x3 = 18 u

60% = ⁶⁰₁₀₀ = ³₅
20% = ²⁰₁₀₀ = ¹₅

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

2 u = 10

1 u = 10 ÷ 2 = 5

Number of erasers that Winnie had more than Victoria in the end
= 18 u - 2 u
= 16 u

Number of erasers that Winnie should give to Victoria so that both had an equal number of erasers in the end
= 16 u ÷ 2
= 8 u
= 8 x 5
= 40

Answer(s): 40