Sarah and Lynn collected stickers. Sarah gave 50% of her stickers to Lynn and as a result, Lynn's stickers increased by 30%. If Sarah had 12 stickers left, find the number of stickers Lynn should give to Sarah in the end so that both had an equal number of stickers.

	Sarah	Lynn	Comparing the change in Lynn's stickers
Before	2x3 = 6 u		10x1 = 10u
Change	- 1x3 = - 3 u	+ 1x3 = + 3 u	+ 3x1 = + 3 u
After	1x3 = 3 u		13x1 = 13 u

50% = ⁵⁰₁₀₀ = ¹₂
30% = ³⁰₁₀₀ = ³₁₀

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

3 u = 12

1 u = 12 ÷ 3 = 4

Number of stickers that Lynn had more than Sarah in the end
= 13 u - 3 u
= 10 u

Number of stickers that Lynn should give to Sarah so that both had an equal number of stickers in the end
= 10 u ÷ 2
= 5 u
= 5 x 4
= 20

Answer(s): 20