Question : 14 workers working 16 hours per day can demolish a building in 81 days. In how many days 18 workers working 24 hours per day can demolish the same building?
Option 1: 54 days
Option 2: 42 days
Option 3: 70 days
Option 4: 30 days
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Correct Answer: 42 days
Solution : Given that 14 workers working 16 hours per day can demolish a building in 81 days, the total man-hours required to demolish the building is, Total man-hours = 14 × 16 × 81 If 18 workers are working 24 hours per day, the number of days they would take to demolish the same building is, Number of days = $\frac{14 \times 16 \times 81}{18 \times 24}$ = 42 Hence, the correct answer is 42 days.
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Question : Working 12 hours per day, Raj can complete a work in 12 days. How many hours per day he should work to finish the same work in 9 days?
Option 1: 20 hours
Option 2: 24 hours
Option 3: 12 hours
Option 4: 16 hours
Question : If 20 men can complete a piece of work in 18 days working 5 hours per day, in how many days can 25 men complete it, working 6 hours per day?
Option 1: 10 days
Option 2: 13 days
Option 3: 11 days
Option 4: 12 days
Question : 12 men can complete a work in 6 days working 4 hours per day. If 4 men work 8 hours per day, then in how many days the same work will be completed?
Option 1: 8 days
Option 2: 6 days
Option 3: 9 days
Option 4: 10 days
Question : 15 men can do a work in 15 days working 8 hours a day. N men can do twice the work in 20 days working 10 hours a day. What is the value of N?
Option 1: 14
Option 2: 12
Option 3: 16
Option 4: 18
Question : Suresh alone can do work in 10 days working 1 hour a day. Balu alone can do the same work in 2 days working 5 hours a day. How many hours do they need to work together in a day to complete the same work in 10 days?
Option 1: 1.5 hours
Option 2: 0.5 hours
Option 3: 1 hour
Option 4: 2 hours
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