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Step-by-step explanation: Let the total work done be 120 which is the LCM of 30, 24 and 20
A+B 1 day work=4
B+C 1 day work=5
C+A 1 day work=6
Add all 3 equations and divide by 2
A+B+C 1 day work=7.5
A's 1 day work= 7.5-5=2.5
In 10 days all 3 complete 75 pieces of work. The rest 45 is completed in 18 days at the rate of 2.5 units per day by A.
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