Amit and bhanu takes same time to finish a work as that of Chirag . Bhanu takes 5 days less than amit And 4 days more than that of Chirag Amit and bahnu working on alternate days will complete the whole work in how many days ???
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Answer:
Amit and Bhanu can do a piece of work in 9 days and 18 days, respectively. As they were ill, they could do 45% and 90% of their efficiency, respectively. How many days will they take to complete the work together?
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If Amit does the job in 9 days, how much does he do in one day? (Hint: 1/9)
If Bhanu does the job in 18 days, how much does he do in one day? (Hint: 1/18)
If Amit does 45% of his usual daily total when sick, how much does he do in one day when sick? (Hint: (1/9)*(45/100))
If Bhanu does 90% of his usual daily total when sick, how much does he do in one day when sick? (Hint: (1/18)*(90/100))
How much then do they complete together in one day, when they’re both sick? (Hint: Add.)
Then how many days will they need to complete the job? (Hint: Invert.)
Amit does (1/9)th of the work in a day when he is healthy. When he fell he did (0.45/9) or (1/20)th of the work in a day.
Bhanu does (1/18)th of the work in a day when he is healthy. When he fell he did (0.9/18) or (1/20)th of the work in a day.
Amit and Bhanu, together, do (1/20)+(1/20) = (1/10)th of the work in a day. So they will take 10 days to complete the work , during the period they are ill.