Risa and Diana collected stickers. Risa gave 30% of her stickers to Diana and as a result, Diana's stickers increased by 25%. If Risa had 49 stickers left, find the number of stickers Diana should give to Risa in the end so that both had an equal number of stickers.

	Risa	Diana	Comparing the change in Diana's stickers
Before	10x1 = 10 u		4x3 = 12u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	7x1 = 7 u		5x3 = 15 u

30% = ³⁰₁₀₀ = ³₁₀
25% = ²⁵₁₀₀ = ¹₄

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

7 u = 49

1 u = 49 ÷ 7 = 7

Number of stickers that Diana had more than Risa in the end
= 15 u - 7 u
= 8 u

Number of stickers that Diana should give to Risa so that both had an equal number of stickers in the end
= 8 u ÷ 2
= 4 u
= 4 x 7
= 28

Answer(s): 28