Question
Priya alone can paint a wall in 30 days. Priya and Neha
together can do it in 18 days. How many days would Neha take to paint the wall by herself?Solution
ATQ,
Let the total work be 90 units {LCM (30 and 18)}
Efficiency of Priya = (90/30) = 3 units/day
Efficiency of Priya and Neha together = (90/18) = 5 units/day
Efficiency of Neha = 5 - 3 = 2 units/day
Time required by Neha to complete the work alone = (90/2) = 45 days
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