Time and Work Problems - Aptitude Questions & Answers

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Time and Work Problems -Aptitude Questions & Answers

Important Formulas –

If A can do a piece of work in n days, then work done by A in 1 day = 1/n
If A does 1/n work in a day, then A can complete the whole work in n days
If A can do a piece of work in x days and B can do the same work in y days, then A and B together can finish it in xy / (x+y) days

Eg: 1 X can complete a piece of work in 12 days and Y completes the same work in 24 days. If both X & Y work together, then the number of days required by X & Y to complete the whole work will is:

A) 8 days B) 4 days C) 6 days D) 9 days

Sol: If X can complete a piece of work in a days and Y completes the same work in b days, then, X & Y together can complete the whole work in a b/ a+ b days

Therefore, the required number of days = 12 × 24/ 36 = 8 days.

Answer: Option (A)

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