If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours? (2 marks)

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Solution

Number of workers and Time taken are varying inversely to each other

So, $W o r k e r s_{1} \times T i m e_{1} = W o r k e r s_{2} \times T i m e_{2}$

Considering

Workers1 = 15

Time1 = 48 hours

Workers2 = w

Time2 = 30 hours

(1 mark)

$15 \times 48 h r = w \times 30 h r w = \frac{15 \times 48}{30} w = 24 w o r k e r s$

(1 mark)

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