Question

420 men can complete construction of a building in 9 months . Due to request by owner of the job was completed in 7 months by employing some more men . find how many more are employed​

Answer 1

Answer:

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Step-by-step explanation:

Men        Time

420         9 months

x             7 months

As the number of workers is inversely proportional to time taken:

420×9=x×7⟹x=7420×9=540

∴ extra men needed: 540−420=120

Answer 2

Men        Time

420         9 months

x             7 months

As the number of workers is inversely proportional to time taken:

420×9=x×7⟹x=7420×9=540

∴ extra men needed: 540−420=120