Brandon, Oscar and Corwin collected erasers in the ratio of 7 : 4 : 4. After Corwin gave ⁷₁₀ to Brandon and Oscar, Corwin had 124 less erasers than Brandon. The number of erasers that Oscar had increased by 60%. How many erasers did Brandon and Corwin have in the end?

	Brandon	Oscar	Corwin
Before	7 u	4 u	4 u
Change	+ 0.4 u	+ 2.4 u	- 2.8 u
After	7.4 u	6.4 u	1.2 u

Number of erasers that Corwin gave to Brandon and Oscar
= ⁷₁₀ x 4 u
= 2.8 u

Number of erasers that Oscar received from Corwin
= ⁶⁰₁₀₀ x 4 u
= 2.4 u

Number of erasers that Brandon received from Corwin
= 2.8 u - 2.4 u
= 0.4 u

Number of less erasers that Corwin had less than Brandon
= 7.4 u - 1.2 u 
= 6.2 u

6.2 u = 124

1 u = 124 ÷ 6.2 = 20

Number of erasers that Brandon and Corwin had
= 7.4 u + 1.2 u
= 8.6 u
= 8.6 x 20
= 172

Answer(s): 172