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

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

3 u = 12

1 u = 12 ÷ 3 = 4

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

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

Answer(s): 20