Sean, Vaidev and Clifford collected pens in the ratio of 11 : 10 : 8. After Clifford gave ⁴₅ to Sean and Vaidev, Clifford had 286 less pens than Sean. The number of pens that Vaidev had increased by 15%. How many pens did Sean and Clifford have in the end?

	Sean	Vaidev	Clifford
Before	11 u	10 u	8 u
Change	+ 4.9 u	+ 1.5 u	- 6.4 u
After	15.9 u	11.5 u	1.6 u

Number of pens that Clifford gave to Sean and Vaidev
= ⁴₅ x 8 u
= 6.4 u

Number of pens that Vaidev received from Clifford
= ¹⁵₁₀₀ x 10 u
= 1.5 u

Number of pens that Sean received from Clifford
= 6.4 u - 1.5 u
= 4.9 u

Number of less pens that Clifford had less than Sean
= 15.9 u - 1.6 u 
= 14.3 u

14.3 u = 286

1 u = 286 ÷ 14.3 = 20

Number of pens that Sean and Clifford had
= 15.9 u + 1.6 u
= 17.5 u
= 17.5 x 20
= 350

Answer(s): 350