Question : A man, a boy, and a woman can finish work in 10 days, 15 days, and 30 days, respectively. In how many days can the work be finished by a man, a woman, and a boy when all of them work together?
Option 1: 10
Option 2: 5
Option 3: 8
Option 4: 6
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Correct Answer: 5
Solution : The work done by man in 1 days = $\frac{1}{10}$ The work done by boy in 1 days = $\frac{1}{15}$ The work done by women in 1 days = $\frac{1}{30}$ The total work done by a man, a woman, and a boy in days = ${\frac{1}{10} + \frac{1}{15} + \frac{1}{30}} = \frac{1}{5}$ Required days = 5 days Hence, the correct answer is 5.
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Question : A man is twice as fast as a woman and twice as fast as a boy at doing work. If all of them a man, a woman, and a boy can finish the work in 7 days, in how many days will a boy do it alone?
Question : 4 women or 6 boys can finish a work in the same number of days. A boy can finish it in 60 days. In how many days can 5 women finish the work, working together every day?
Question : 2 men can finish a work in 6 days and 3 women can finish the same work in 4 days. How many days will 1 man and 2 women finish the work if they work together daily?
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