15 men can finish a piece of work in 40 days. The number

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15 men can finish a piece of work in 40 days. The number of days after which 5 men should leave the work so that the work is finished in 45 days altogether is :

Let 5 men leave the work after x days.
∵ M₁D₁ = M₂D₂ + M₃D₃
∴ 15 × 40 = 15 × x + 10 × (45 – x)
⇒ 600 = 15x + 450 – 10x
⇒ 600 – 450 = 5x Þ 5x = 150

⇒ x =	150	30 days
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