### 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?

# Average Temperature

##### Age 11 to 14 ShortChallenge Level

The average temperature in 6 European cities is 5$^\circ$ Celsius.

What is the new average temperature, if two more cities, with temperatures of 12$^\circ$ Celsius and $-$6$^\circ$ Celsius, are added to the list?

This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.