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If 4 men can reap a field in 5 days working 9 hours a day, in how many days can 10 men reap the same field working 6 hours a day?

If 4 men can reap a field in 5 days working 9 hours a day, in how many days can 10 men reap the same field working 6 hours a day? Correct Answer 3

​Given:

4 men can reap a field in 5 days working 9 hours a day

Formula used:

(M1 × D1 × H1)/W1 = (M2 × D2 × H2)/W2

Calculation:

(4 × 5 × 9)/1 = (10 × D2 × 6)/1

⇒ D2 = (4 × 5 × 9)/(10 × 6)

⇒ D2 = 3 

∴ The required number of days are 3.

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