### Roman Distances

Marcus' atrium was a square with each side 50 pedes long. How many times did Marcus have to walk round his atrium to complete his daily exercise of 8 stadia?

# Petrol Prices

##### Stage: 3 Short Challenge Level:

$u(s-3)$.

Unleaded costs $s-3$ pence per litre, so $u$ litres of unleaded costs $u(s-3)$.

This problem is taken from the UKMT Mathematical Challenges.