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Both X and Y together can complete a work in 12 days and Y alone can complete the same work in 30 days. In how many days will X alone complete the work?1). 152). 203). 184). 16 |
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Answer» X and Y TOGETHER can complete a WORK = 12 days Y ALONE can complete the same work = 30 Let X alone can complete the same work = x days ⇒ 1/x + 1/30 = 1/12 ⇒ 1/x = 1/12 - 1/30 ⇒ 1/x = (30 - 12)/(30 × 12) ∴ x = 20 days |
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