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Bucket of Water

Stage: 3 Short Challenge Level: Challenge Level:1
See all short problems arranged by curriculum topic in the short problems collection

Lisa's bucket does not have a hole in it and weighs 21 kg when full of water.
After she pours out half the water from the bucket it weighs 12 kg.
What is the weight of the empty bucket?

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.