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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

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?

Balancing the Books

Age 11 to 14 Short Challenge Level:


Over a two-week period, the required number of visitors is 14 x 30 000 = 420 000.

Therefore the number required this week is 420 000 - 120 000 = 300 000 visitors


This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.