How many integers between 1 and 1200 are NOT multiples of any of
the numbers 2, 3 or 5?
Pizza, Indian or Chinese takeaway. Each teenager from a class only likes two of these, but can you work which two?
A maths exam contained only
two questions. Problem one was solved by 70% of the pupils. Problem
two was solved by 60% of them. Every pupil solved at least one of
the problems. Nine pupils solved both problems. How many pupils
took the exam?