Question : Anuj's efficiency is 150 percent of Vinod's efficiency. If Anuj can complete a work in 20 days, then how many days will they together take to complete the same work?
Option 1: 6 days
Option 2: 9 days
Option 3: 15 days
Option 4: 12 days
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Correct Answer: 12 days
Solution : Let Vinod's efficiency be $x$ Let the total time taken by them to complete the work = $t$ days Anuj's efficiency = $\frac{3}{2}x$ Number of days taken by Anuj to complete the work = 20 days Total work = Efficiency × Time Now, $20\times \frac{3}2x=t\times (\frac{3}{2}x+x)$ ⇒ $t=12$ days Hence, the correct answer is 12 days.
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Question : A and B together can complete a work in 20 days. B and C together can complete the same work in 15 days. If A, B, and C all work together, then the same work gets completed in 10 days. How many days will A and C together take to complete the same work?
Option 1: 8 days
Option 2: 10 days
Question : A can complete a piece of work in 9 days. B and C can complete the same work in 12 days and 18 days respectively. If A, B, and C work together, then in how many days will they complete the work?
Option 1: 10 days
Option 2: 8 days
Option 3: 4 days
Option 4: 15 days
Question : Ram can complete a piece of work in 18 days, Reena can complete the same work in 12 days, and with the help of Shyam, they finish the same work in 6 days. In how many days can Shyam alone complete the same work?
Option 1: 42 days
Option 2: 36 days
Option 3: 30 days
Option 4: 24 days
Question : 40 men can complete a work in 18 days. Eight days after they started working together, 10 more men joined them. How many days will it now take to complete the remaining work?
Option 1: 6
Option 2: 8
Option 3: 10
Option 4: 12
Question : A alone can complete a work in 40 days. 20 percent of the same work will be completed by A in how many days?
Option 3: 5 days
Option 4: 6 days
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