$15$ persons complete a work in $4$ days by working $6$ hours a day. How many days it will take to complete the work if $5$ persons work same hours per day?

20

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30

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12

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18

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Solution

The correct option is C $12$
No of person is inversely proportional to the no of days.
Again, no of hours is inversely proportional to the no of days.
So, $15 \times 4 = k = 5 \times x$
$\Rightarrow x = 12$ ; taking no of hours per day constant.

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15 persons complete a work in 4 days by working 6 hours a day. How many days it will take to complete the work if 5 persons work same hours per day?

The correct option is C 12No of person is inversely proportional to the no of days.Again, no of hours is inversely proportional to the no of days.So, 15×4=k=5×x⇒x=12; taking no of hours per day constant.

$15$ persons complete a work in $4$ days by working $6$ hours a day. How many days it will take to complete the work if $5$ persons work same hours per day?

The correct option is C $12$
No of person is inversely proportional to the no of days.
Again, no of hours is inversely proportional to the no of days.
So, $15 \times 4 = k = 5 \times x$
$\Rightarrow x = 12$ ; taking no of hours per day constant.