If m men can do a work in r days, then the number of days taken by (m + n) men to do it is :
\(\frac{{{ \text{m}} + { \text{n}}}}{{{ \text{mn}}}}\)
\(\frac{{{ \text{m}} + { \text{n}}}}{{{ \text{mr}}}}\)
\(\frac{{{ \text{mr}}}}{{{ \text{m}} + { \text{n}}}}\)
\(\frac{{{ \text{r}}\left( {{ \text{m}} + { \text{n}}} \right)}}{{{ \text{mn}}}}\)
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A man undertakes to do a certain work in 150 days. He employs 200 men. He finds that only a quarter of the work is done in 50 days. The number of additional men that should be appointed so that the whole work will be finished in time is = ?
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A can do a piece of work in 5 days less than the time taken by B to do it. If both of them together take \({ \text{11}}\frac{1}{9}\) days, then the time taken by B alone to do the same work (in days ) is?
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3
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12 monkeys can eat 12 bananas in 12 minutes. In how many minutes can 4 monkeys eat 4 bananas ?
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A and B can do a piece of work in 12 days, B and C in 8 days and C and A in 6 days. How long would B take to do the same work alone ?
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5
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If 10 persons can do a job in 20 days, then 20 person with twice the efficiency can do the same job in:
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6
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A can do a piece of work in 12 days and B in 24 days. If they work together, in how many days will they finish the work ?
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7
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A and B together can complete a task in 20 days. B and C together can complete the same task in 30 days. A and C together can complete the same task in 40 days. What is the respective ratio of the number of days taken by A when completing the same task alone to the number of days taken by C when completing the same task alone?
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A and B together can do a job in 2 days; B and C can do it in 4 days; A and C in \({ \text{2}}\frac{2}{5}\) days. The number of days required for A to do the job alone is = ?
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A can do a work in 15 days and B in 20 days. If they together work on it for 4 days, what fraction of the work will be left ?
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10
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A can finish a work in 18 days and B can do the same work in 15 days. B worked for 10 days and left the job. In how many days, A alone can finish the remaining work?
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