A completes 60% of a job in 15 days and then b and c join him.b is 50% as efficient as a and c is 50% as efficient as b . How many more days will they complete the work
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Answer:
5 5/7 dyas
Step-by-step explanation:
efficiency ratio, A :B:C = 100% : 50% of 100% : 50% of 50% of 100%
= 100% : 50% : 25% = 4 : 2 : 1
60% of work = 15 × 4 = 60 units
100% = 1×100 = 100 units
remaining work = 40 units
they will complete the remaining work in
= 40/ 7 days = 5 5/ 7 days
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