Which of the following statements are of inverse variation ?(1) Number

1.	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 vehicle and its cost(4) Area of circle and its radius.
Answer» Answer: Number of workers on a job and time taken by them to complete the job Number of pipes of same SIZE to fill a tank and the time taken by them to fill the tank Step-by-step explanation: following statements are of inverse variation : 1. Number of workers on a job and time taken by them to complete the job. As number of Workers INCREASE time Taken is Decreased Time Taken by Workers = Total Work Done / number of Workers 2. Number of pipes of same size to fill a tank and the time taken by them to fill the tank. As Number of pipes increase time Taken is Decreased Time Taken by pipes = Tank FILLED / Number of Pipes Following Statements are of DIRECT proportion : Petrol filled in the tank of a vehicle and its cost Cost = Petrol filled * Petrol Price Area of circle and its radius. Area of circle ∝ Radius²

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 vehicle and its cost(4) Area of circle and its radius.

Answer»

Answer:

Number of workers on a job and time taken by them to complete the job

Number of pipes of same SIZE to fill a tank and the time taken by them to fill the tank

Step-by-step explanation:

following statements are of inverse variation :

1. Number of workers on a job and time taken by them to complete the job.

As number of Workers INCREASE time Taken is Decreased

Time Taken by Workers = Total Work Done / number of Workers

2. Number of pipes of same size to fill a tank and the time taken by them to fill the tank.

As Number of pipes increase time Taken is Decreased

Time Taken by pipes = Tank FILLED / Number of Pipes

Following Statements are of DIRECT proportion :

Petrol filled in the tank of a vehicle and its cost

Cost = Petrol filled * Petrol Price

Area of circle and its radius.

Area of circle ∝ Radius²