Question

Which of the following quantities vary inversely as each other?

• A. The number of $x$ men hired to construct a wall and the time $y$ is taken to finish the job.
• B. The length $x$ of a journey by bus and price $y$ of the ticket.
• C. To complete $x$ km journey by a car, it consume $y$ liters petrol.
• D. None of these

Answer 1

The correct option is A The number of $x$ men hired to construct a wall and the time $y$ is taken to finish the job.

$\to$ If the number of men is more, the time taken to construct a wall will be less. Therefore, it is an inverse variation.

$\to$ If the length of a journey is more, the price of the bus ticket will also be more. Therefore, it is not inverse variation.

$\to$ If the length of the journey is more, the amount of petrol consumed by the car will also be more. Therefore, it is not inverse variation.