Athletics club

An athletics club has girl, boy and adult members. How many members does the club have?
Age
11 to 14
Challenge level
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Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



An athletics club has two types of member: junior and adult. The junior members are either boys or girls. There are $16$ more adult members than there are junior members.

The ratio of girls to boys to adults is $3:4:9$.

In total, how many members does the club have?

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