Mathematics for IGCSE & O level - Ratio And Proportion (Section 4 - No. 18)

Which relationships exemplify inverse proportion?

The time taken to travel a fixed distance and the speed of the travel.

The amount of work done and the number of workers.

The number of items bought with a certain budget and the price of each item.

The side length of a square and its perimeter.

Inverse proportion means the increase in one quantity corresponds to decrease in another.