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X can do a piece of work in 25 days. Y is 25% more efficient than X. The number of days taken by Y is:1. 15 days2. 20 days3. 30 days4. 10 days |
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Answer» Correct Answer - Option 2 : 20 days Given: X can do a piece of work = 25 days Percentage increase in efficiency (a) = 25% Calculation: X’s one day work = 1/25 Y’s one day work = X’s one day’s work × (100 + a)/100 Y’s one day work ⇒ (1/25) × (100 + 25)/100 ⇒ (1/25) × 125/100 ⇒ 1/20 Y alone takes 20 days. ∴ The number of days taken by Y is 20 days. |
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