Usha and Tiffany collected stamps. Usha gave 60% of her stamps to Tiffany and as a result, Tiffany's stamps increased by 20%. If Usha had 22 stamps left, find the number of stamps Tiffany should give to Usha in the end so that both had an equal number of stamps.

	Usha	Tiffany	Comparing the change in Tiffany's stamps
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 stamps that Tiffany had is repeated.  Make the increase in the number of stamps that Tiffany had the same. LCM of 3 and 1 = 3

2 u = 22

1 u = 22 ÷ 2 = 11

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

Number of stamps that Tiffany should give to Usha so that both had an equal number of stamps in the end
= 16 u ÷ 2
= 8 u
= 8 x 11
= 88

Answer(s): 88