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

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

3 u = 30

1 u = 30 ÷ 3 = 10

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

Number of stickers that Kathy should give to Wendy so that both had an equal number of stickers in the end
= 10 u ÷ 2
= 5 u
= 5 x 10
= 50

Answer(s): 50