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If a job is to be completed in 10 days, it requires 270 persons. If 180 persons take up the same job, they will finish it in

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. 20 days
  2. 18 days
  3. 15 days
  4. 12 days

Answer (Detailed Solution Below)

Option 3 : 15 days
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Detailed Solution

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Calculation

For a given job to be completed, the product number of persons and number of days remains constant.

270 persons complete job in 10 days.

Let 180 persons complete in D2 days.

P1 × D1 = P2 × D2

270 × 10 = 180 × D2

\({D_2} = \frac{{270 \times 10}}{{180}} = 15days\)

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