Zane, Cole and Charles collected stickers in the ratio of 7 : 8 : 9. After Charles gave ³₁₀ to Zane and Cole, Charles had 40 less stickers than Zane. The number of stickers that Cole had increased by 30%. How many stickers did Zane and Charles have in the end?

	Zane	Cole	Charles
Before	7 u	8 u	9 u
Change	+ 0.3 u	+ 2.4 u	- 2.7 u
After	7.3 u	10.4 u	6.3 u

Number of stickers that Charles gave to Zane and Cole
= ³₁₀ x 9 u
= 2.7 u

Number of stickers that Cole received from Charles
= ³⁰₁₀₀ x 8 u
= 2.4 u

Number of stickers that Zane received from Charles
= 2.7 u - 2.4 u
= 0.3 u

Number of less stickers that Charles had less than Zane
= 7.3 u - 6.3 u 
= 1 u

1 u = 40

1 u = 40 ÷ 1 = 40

Number of stickers that Zane and Charles had
= 7.3 u + 6.3 u
= 13.6 u
= 13.6 x 40
= 544

Answer(s): 544