Question
Neha and Seema can finish a work in 10 days and 25 days,
respectively, when working alone. Neha started the work. After how many days should Seema join to complete the entire task in 9 days?Solution
ATQ,
Let the total work be 50 units (LCM of 10 and 25)
Efficiency of Neha = (50 / 10) = 5 units/day
Efficiency of Seema = (50 / 25) = 2 units/day
Let Seema join after 'n' days.
So, 5n + (5 + 2) × (9 - n) = 50
⇒ 5n + 63 - 7n = 50
⇒ 2n = 13
⇒ n = 6.5
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