Charlie, Caden and Cai collected erasers in the ratio of 10 : 4 : 9. After Cai gave ³₁₀ to Charlie and Caden, Cai had 104 less erasers than Charlie. The number of erasers that Caden had increased by 30%. How many erasers did Charlie and Cai have in the end?

	Charlie	Caden	Cai
Before	10 u	4 u	9 u
Change	+ 1.5 u	+ 1.2 u	- 2.7 u
After	11.5 u	5.2 u	6.3 u

Number of erasers that Cai gave to Charlie and Caden
= ³₁₀ x 9 u
= 2.7 u

Number of erasers that Caden received from Cai
= ³⁰₁₀₀ x 4 u
= 1.2 u

Number of erasers that Charlie received from Cai
= 2.7 u - 1.2 u
= 1.5 u

Number of less erasers that Cai had less than Charlie
= 11.5 u - 6.3 u 
= 5.2 u

5.2 u = 104

1 u = 104 ÷ 5.2 = 20

Number of erasers that Charlie and Cai had
= 11.5 u + 6.3 u
= 17.8 u
= 17.8 x 20
= 356

Answer(s): 356