Elijah bought 50% more stickers than Isabella. Layla bought 35% fewer stickers than Elijah. Elijah and Isabella gave Layla some stickers in the ratio 2 : 1. As a result, Layla had twice as much stickers as before. Given that Elijah had 18 less stickers than Isabella in the end, how much stickers did Elijah and Isabella give to Layla?

	Elijah	Isabella	Layla
	3x20	2x20
	20x3		13x3
Before	60 u	40 u	39 u
Change			+ (2 x 39 u) = + 78 u
	- 2x26 = - 52 u	- 1x26 = - 26 u	+ 3x26 =  + 78 u
After	8 u	14 u	117 u

100% + 50% = 150%
150% = ¹⁵⁰₁₀₀ = ³₂

100% - 35% = 65%
65% = ⁶⁵₁₀₀ = ¹³₂₀

The number of stickers that Elijah had at first is the repeated identity.
LCM of 3 and 20 = 60

The change in the number of stickers that Layla had is the repeated identity when Elijah and Isabella gave to Layla.
LCM of 78 and 3 = 78

Number of stickers that Elijah had less than Isabella in the end
= 14 u - 8 u
= 6 u

6 u = 18
1 u = 18 ÷ 6 = 3

Number of stickers that Elijah and Isabella gave to Layla
= 52 u + 26 u
= 78 u
= 78 x 3
= 234

Answer(s): 234