Ivory and Kathy collected stickers. Ivory gave 30% of her stickers to Kathy and as a result, Kathy's stickers increased by 10%. If Ivory had 28 stickers left, find the number of stickers Kathy should give to Ivory in the end so that both had an equal number of stickers.

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

7 u = 28

1 u = 28 ÷ 7 = 4

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

Number of stickers that Kathy should give to Ivory so that both had an equal number of stickers in the end
= 26 u ÷ 2
= 13 u
= 13 x 4
= 52

Answer(s): 52