Mark, Bryan and Cooper collected stickers in the ratio of 8 : 6 : 9. After Cooper gave ⁷₁₀ to Mark and Bryan, Cooper had 380 less stickers than Mark. The number of stickers that Bryan had increased by 35%. How many stickers did Mark and Cooper have in the end?

	Mark	Bryan	Cooper
Before	8 u	6 u	9 u
Change	+ 4.2 u	+ 2.1 u	- 6.3 u
After	12.2 u	8.1 u	2.7 u

Number of stickers that Cooper gave to Mark and Bryan
= ⁷₁₀ x 9 u
= 6.3 u

Number of stickers that Bryan received from Cooper
= ³⁵₁₀₀ x 6 u
= 2.1 u

Number of stickers that Mark received from Cooper
= 6.3 u - 2.1 u
= 4.2 u

Number of less stickers that Cooper had less than Mark
= 12.2 u - 2.7 u 
= 9.5 u

9.5 u = 380

1 u = 380 ÷ 9.5 = 40

Number of stickers that Mark and Cooper had
= 12.2 u + 2.7 u
= 14.9 u
= 14.9 x 40
= 596

Answer(s): 596