Practice Test Discussion

20 men can cut some trees in 4 hours. If 4 men leave the job, how many trees will be cut in 12 hours?

[UP (police) 2007]

72 trees

80 trees

68 trees

79 trees

None of these

Explanation

According to the given formula,

Given that

M₁= 20, D₁= 4, W₁ = 30,

M₂ = 20 - 4 = 16

D₂= 12, W₂ = ?

According to the formula, M₁D₁W₂=M₂D₂W₁

$20 \times 4 \times W_{2} = 16 \times 12 \times 30 W_{2} = \frac{16 \times 12 \times 30}{20 \times 4} \Rightarrow 12 \times 6 = 72 t r e e s$

Hence option A is correct

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