20 men can cut 30 tree in 4 h. If 4 men leave the job,

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20 men can cut 30 tree in 4 h. If 4 men leave the job, how many trees will be cut in 12 h?

1. 72
2. 80
3. 68
4. 79

Correct Option: A

Given, M₁ = 20, T₁ = 4, W₁ = 30,
M₂ = 20 - 4 = 16, T₂ = 12 and W₂ = ?
According to the formula,
M₁T₁W₂ = M₂T₂W₁
⇒ 20 x 4 x W₂ = 16 x 12 x 30
∴ W₂ = (16 x 12 x 30)/(20 x 4) = 12 x 6 = 72 trees