20 workers working for 5 h per day complete a work in 10

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20 workers working for 5 h per day complete a work in 10 days. If 25 workers are employed to work 10 h per days, what is the time required to complete the work ?

1. 4 days
2. 5 days
3. 6 days
4. 8 days

Correct Option: A

Given, M₁= 20, M₂ = 25, T₁ = 5, T₂ = 10, D₁ = 10 and D₂ = ?
According to the formula,
M₁T₁D₁= M₂T₂D₂
⇒ 20 x 5 x 10 = 25 x 10 x D₂
∴ D₂ = 20 x 5 x 10/25 x 10 = 4 days