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A certain number of men can complete a job in 30 days. If there were 5 men more, it could be completed in 10 days less. How many men were in the beginning?
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- 10
- 15
- 20
- 25
Correct Option: A
Let initially the number of men be x.
⇒ According to question,
M1D1 W2 = M2 D2 W1
x × 30 = (x + 5) × (30 – 10)
x × 30 = 20x + 100
30x – 20x = 100
10x = 100
x = 10
Aliter : Using Rule 23,
Here, D = 30, a = 5, d = 10
Required number
| = | d |
| = | = 10 | 10 |
