Question

Which of the following statements are of inverse variation?
(1) Number of workers on a job and time taken by them to complete the job.
(2) Number of pipes of same size to fill a tank and the time taken by them to fill the tank.
(3) Petrol filled in the tank of a vehical and its cost
(4) Area of circle and its radius.

Answer 1

(1) The number of workers on a job and time taken by them to complete the job are in inverse variation as increase in the number of workers on a job decreases the time taken by the workers to complete the job.

(2) The number of pipes of same size to fill a tank and the time taken by them to fill the tank are in inverse variation as increase in the number of pipes of same size to fill a tank decreses the time taken by them to fill the tank.

(3) The petrol filled in the tank of a vehical and its cost are in direct proportion as increase in the amount of petrol filled in the tank of a vehical increases the cost paid for the petrol.

(4) The area of circle and its radius are in direct proportion as increase in the radius of the circle increases the area of the circle.