Ethan, Rael and Christopher collected erasers in the ratio of 8 : 7 : 6. After Christopher gave ⁷₁₀ to Ethan and Rael, Christopher had 194 less erasers than Ethan. The number of erasers that Rael had increased by 10%. How many erasers did Ethan and Christopher have in the end?

	Ethan	Rael	Christopher
Before	8 u	7 u	6 u
Change	+ 3.5 u	+ 0.7 u	- 4.2 u
After	11.5 u	7.7 u	1.8 u

Number of erasers that Christopher gave to Ethan and Rael
= ⁷₁₀ x 6 u
= 4.2 u

Number of erasers that Rael received from Christopher
= ¹⁰₁₀₀ x 7 u
= 0.7 u

Number of erasers that Ethan received from Christopher
= 4.2 u - 0.7 u
= 3.5 u

Number of less erasers that Christopher had less than Ethan
= 11.5 u - 1.8 u 
= 9.7 u

9.7 u = 194

1 u = 194 ÷ 9.7 = 20

Number of erasers that Ethan and Christopher had
= 11.5 u + 1.8 u
= 13.3 u
= 13.3 x 20
= 266

Answer(s): 266