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A can do a work in 12 days and B can do the same work in 16 days. If they work on it together for 4 days. Then the fraction of the work that is left is:1. 7/82. 9/163. 3/54. 5/12 |
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Answer» Correct Answer - Option 4 : 5/12 Given- Time taken by A to do a work = 12 days Time taken by B to do the same work = 16 days Concept Used- Total Work = Efficiency × Total Time Calculation- Let the total work be 48 units. Efficiency of A = 48/12 ⇒ 4 Efficiency of B = 48/16 ⇒ 3 Work done them in 4 days = 4 × (4 + 3) ⇒ 28 units Left Work = 48 - 28 ⇒ 20 units ∴ Fraction of work that is left = 20/48 ⇒ 5/12 |
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