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?
Explanation:
Let the number of staff that were supposed to come = x ∴ x men were supposed to complete the work in 18 days Whereas, (x – 6) men completed the same work in 20 days.
⇒ x × 18 = (x – 6) × 20 ⇒ 18x = 20x – 120 ⇒ 120 = 2x ⇒ x = 60
Hence, option (d).
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