Question

plz answer this question

6 pumps can empty a tank in 12 hours . how many pumps will empty the tank in 18 hours​

Answer 1

use unitary method

12hr = 6pumps

1hr = 6/12

∴18hr= 6/12 ×18

         = 9 pumps

hope it helps.....

Answer 2

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$let \: \: x \: \: \: be \: \: \: no. \: \: \: of \: \: \: pumps \: \: in \: 18 \: \: hr\\ \\ \frac{6}{x} = \frac{12}{18} \\ \\ x = \frac{6 \times 18}{12} \\ \\ x = \frac{18}{2} \\ \\ x = 9$

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