Question

A Contractor
has
work force of
420
who finishes certain piece
ot work
q
months. How
many
mon must he
to
employ complete the
work in
in 7 months?"
in​

Answer 1

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

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Answer 2

total men needed are 540 and extra men are 120