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Age 11 to 14 Short
Challenge Level

Answer: 32

8 flapjacks:                               We have: 
2 oz butter                                14 oz butter ($\times$7)
3 oz sugar                                 15 oz sugar ($\times$5)
4 oz rolled oats                          16 oz rolled oats ($\times$4)

8$\times$4 = 32 (and there will be some butter and sugar left over).

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