Arin alone can do a piece of work in 6 days and Selvi alone can do the same in 8 days. Arin and Selvi undertook to do it for Rs. 7,200. With the help of Kevin, they completed the work in 3 days. How much is to be paid to Kevin?
Solution:
Total Work = LCM of 6, 8 and 3 = 24 unit
Efficiency of Arin = = 4 unit per day
Efficiency of Selvi = = 3 unit per day
Efficiency of Kevin+ Arin+ Selvi = = 8 unit per day
Efficiency of Kevin = 8 - 4-3 = 1unit
Share of Kevin = ×2400 = Rs.900
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