Clubs

How many students are in the maths club and the science club?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative


At Kaynem Daly High School, the Maths Club has 15 members and the Science Club has 12.

If a total of 13 students belong to only one of the two clubs, how many belong to both clubs?

This problem is taken from the World Mathematics Championships