Question

'J', 'K' and 'L' can complete a task alone in 42, 21, and

Q: Answer-'J', 'K' and 'L' can complete a task alone in 42, 21, and 14 days respectively. If 'K' and 'L' work...

ATQ,Let the total work L.C.M of 42, 21, and 14 84 unitsEfficiency of J 84 42 2 unitsdayEfficiency of K 84 21 4 unitsdayEfficiency of L 84 14 6 unitsdayWork done by J in 7 days 2 7 14 unitsWork done by K and L in x days 84 - 14 70 unitsSo, x 70 4 6 7

14 days respectively. If 'K' and 'L' work together for 'x' days and leave, then 'J' completes the rest in 7 days. What is the value of 'x'?

A 10

B 14

C 18

D 7

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'J', 'K' and 'L' can complete a task alone in 42, 21, and

Solution