Sabrina and Xuan collected stickers. Sabrina gave 30% of her stickers to Xuan and as a result, Xuan's stickers increased by 10%. If Sabrina had 49 stickers left, find the number of stickers Xuan should give to Sabrina in the end so that both had an equal number of stickers.

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

7 u = 49

1 u = 49 ÷ 7 = 7

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

Number of stickers that Xuan should give to Sabrina so that both had an equal number of stickers in the end
= 26 u ÷ 2
= 13 u
= 13 x 7
= 91

Answer(s): 91