Copyright © University of Cambridge. All rights reserved.

A rectangle with area $125\;\mathrm{cm}^2$ has sides in the ratio $4:5$.

What is the perimeter of the rectangle?

If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.

See all short problems arranged by curriculum topic in the short problems collection

This problem is taken from the UKMT Mathematical Challenges.