4) A, B and C can independently do a iwork in 15 days, 20 days and 30 days. respectively. They work together for some time after which Cleaves. A total of Rs. 18000 is paid for the work and B gets Rs. 6000 more than C. for how many days did A work?

Explanation

Let total work done is 60 units

so, A has 4 units /day,B has 3 units /day,C has 2 units /day


let B get 3x salary so A get 4x salary and C get 3x-6000

so,`3x-6000+3x+4x=18000`

`x=2400`

so C total salary is `3x-6000=1200`

so when C worked A and B must get 2400 and 1800 salary so,total 5400 salary

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