dev completed the school project in 20 days.how many days will arun take to complete same work if he is 25%more efficient than dev
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Step-by-step explanation: Simple technique is-
Dev takes 20 days to complete a work .
Arun is 25% more efficent means he takes 5 days less means 15 days.
Total work to be done is 60 and dev does 3 thing in 1 day
and arun does 4 thing in in day out of 60
by dividing, total work to be done by arun =60/4 = 15 days
Answer is 15 days
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