Perry, Gabriel and Charlie collected erasers in the ratio of 9 : 5 : 7. After Charlie gave ⁷₁₀ to Perry and Gabriel, Charlie had 452 less erasers than Perry. The number of erasers that Gabriel had increased by 10%. How many erasers did Perry and Charlie have in the end?

	Perry	Gabriel	Charlie
Before	9 u	5 u	7 u
Change	+ 4.4 u	+ 0.5 u	- 4.9 u
After	13.4 u	5.5 u	2.1 u

Number of erasers that Charlie gave to Perry and Gabriel
= ⁷₁₀ x 7 u
= 4.9 u

Number of erasers that Gabriel received from Charlie
= ¹⁰₁₀₀ x 5 u
= 0.5 u

Number of erasers that Perry received from Charlie
= 4.9 u - 0.5 u
= 4.4 u

Number of less erasers that Charlie had less than Perry
= 13.4 u - 2.1 u 
= 11.3 u

11.3 u = 452

1 u = 452 ÷ 11.3 = 40

Number of erasers that Perry and Charlie had
= 13.4 u + 2.1 u
= 15.5 u
= 15.5 x 40
= 620

Answer(s): 620