Question

If 12 machines 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?

Answer 1

21 days

Solution:-

let total number of days be x for finish.

machines hours days. quantity

(↓). (↓). (↑). (↑)

12 7 18 1

16. 9. x. 2

________________________________

x/18 = (12/16)×(7/9)×(2/1)

x = (12×7×2×18) / (16×9×1)

= (3×7×2×2) / ( 4×1)

= 3×7

= 21 days

Therefore the number of days = 21 days

Hope this helps you

Answer 2

Answer:

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