If 3 men or 6 boys can do a piece of work in 10 days, working 7 hours a day; how many days will it take to complete a piece of work twice as large with 6 men and 2 boys working together for 8 hours a day?
Solution
Correct Answer: Option B
here, 3 man=6 boys so,1 men=6/3 boys so,6 men=6x6/3=12 boys so,6 men +2 boys=12+2=14boys 6 boys complete the work in 70 hours 1 boys complete the work in 70x6 hours 14 boys complete the work in 70x6/14 hours=30 hours to do double work needs=30x2=60 hhours total days=60/8=7.5 days
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