Tiffany and Gwen collected stickers. Tiffany gave 60% of her stickers to Gwen and as a result, Gwen's stickers increased by 20%. If Tiffany had 12 stickers left, find the number of stickers Gwen should give to Tiffany in the end so that both had an equal number of stickers.

	Tiffany	Gwen	Comparing the change in Gwen's stickers
Before	5x1 = 5 u		5x3 = 15u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	2x1 = 2 u		6x3 = 18 u

60% = ⁶⁰₁₀₀ = ³₅
20% = ²⁰₁₀₀ = ¹₅

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

2 u = 12

1 u = 12 ÷ 2 = 6

Number of stickers that Gwen had more than Tiffany in the end
= 18 u - 2 u
= 16 u

Number of stickers that Gwen should give to Tiffany so that both had an equal number of stickers in the end
= 16 u ÷ 2
= 8 u
= 8 x 6
= 48

Answer(s): 48