You may also like

Bat Wings

Two students collected some data on the wingspan of bats, but each lost a measurement. Can you find the missing information?

Kate's Date

When Kate ate a giant date, the average weight of the dates decreased. What was the weight of the date that Kate ate?

Balancing the Books

How many visitors does a tourist attraction need next week in order to break even?

Unequal Averages

Age 11 to 14
Challenge Level

This printable worksheet may be useful: Unequal Averages.

This problem featured in an NRICH webinar in December 2020.

You may wish to look at Wipeout as a follow-up activity.

The Inquiry Maths website offers a related activity and explains how it can be used as an inquiry prompt in the classroom.

Here is a photo of some of the contributions offered by delegates at the ATM Conference in 2015.