Caden, Owen and Christopher collected pens in the ratio of 7 : 7 : 5. After Christopher gave ⁷₁₀ to Caden and Owen, Christopher had 83 less pens than Caden. The number of pens that Owen had increased by 10%. How many pens did Caden and Christopher have in the end?

	Caden	Owen	Christopher
Before	7 u	7 u	5 u
Change	+ 2.8 u	+ 0.7 u	- 3.5 u
After	9.8 u	7.7 u	1.5 u

Number of pens that Christopher gave to Caden and Owen
= ⁷₁₀ x 5 u
= 3.5 u

Number of pens that Owen received from Christopher
= ¹⁰₁₀₀ x 7 u
= 0.7 u

Number of pens that Caden received from Christopher
= 3.5 u - 0.7 u
= 2.8 u

Number of less pens that Christopher had less than Caden
= 9.8 u - 1.5 u 
= 8.3 u

8.3 u = 83

1 u = 83 ÷ 8.3 = 10

Number of pens that Caden and Christopher had
= 9.8 u + 1.5 u
= 11.3 u
= 11.3 x 10
= 113

Answer(s): 113