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If twelve machines working 7 hours a day can finish a work in 18 days, in how many days will 16 machines working 9 hours a day finish twice the work?
1. 21 days
2. 18 days
3. 24 days
4. 16 days

1 Answer

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Best answer
Correct Answer - Option 1 : 21 days

Given:

Time taken by 12 machines working 7 hours a day = 18 days 

Formula used:

(M1 × D1 × H1)/W1 = (M2 × D2 × H2)/W2 

Calculation:

By using the above formula for calculating the no of days:

(12 × 18 × 7)/1 = (16 × D2 × 9)/2

⇒ 12 × 18 × 7 × 2/(16 × 9) = D2 

⇒ D2 = 21 days 

∴ 16 machines working 9 hours a day finish twice the work in 21 days. 

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