Some staff promised to do a job in 18 days, but 6 of them

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Some staff promised to do a job in 18 days, but 6 of them went on leave. So the remaining men took 20 days to complete the job. How many men were there originally ?

1. 55
2. 62
3. 56
4. 60

Correct Option: D

Using Rule 1,
Number of men originally = x (let)
∴ M₁ D₁ = M₂ D₂
⇒ x × 18 = (x – 6) × 20
⇒ x × 9 = (x – 6) × 10
= 10x – 60
⇒ 10x – 9x = 60
⇒ x = 60 men