Tiffany and Wendy collected erasers. Tiffany gave 30% of her erasers to Wendy and as a result, Wendy's erasers increased by 10%. If Tiffany had 35 erasers left, find the number of erasers Wendy should give to Tiffany in the end so that both had an equal number of erasers.

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

7 u = 35

1 u = 35 ÷ 7 = 5

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

Number of erasers that Wendy should give to Tiffany so that both had an equal number of erasers in the end
= 26 u ÷ 2
= 13 u
= 13 x 5
= 65

Answer(s): 65