### 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?

### Grandpa's Rock Cakes

Weekly Problem 34 - 2012
Grandpa made a super-heavy rock cake. Five people have guessed the weight of the cake. Can you work out the weight of his cake?

### Marathon Mission

Weekly Problem 33 - 2012
Minnie trained more for the London Marathon this year, so her speed increased. By what percentage did her time decrease?

# Balancing the Books

##### Stage: 3 Short Challenge Level:
See all short problems arranged by curriculum topic in the short problems collection

A tourist attraction, which opens every day, needs 30 000 visitors per day on average to break even. Last week there were 120 000 visitors.

What is the number of visitors needed this week to break even over the two-week period?

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

This problem is taken from the UKMT Mathematical Challenges.