Q. 23.7( 13 Votes )
If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours?
The number of workers building a wall and time taken by them is inversely proportional.
Let x be the number of workers and y be the time taken.
(k is constant) (1)
Number of workers given=15
Time took =48 hrs
(Put in 1)
Wall has to be built in 30 hours
(Put in 1)
So, 24 workers are needed to build the wall in 30 hours.
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Which of the following statements is of inverse variation?
(1) The number of workers on a job and time taken by them to complete the job.
(2) The number of pipes of the same size to fill a tank and the time taken by them to fill the tank.
(3) Petrol filled in the tank of a vehicle and its cost.
(4) Area of the circle and its radius.
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