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Lisa's bucket 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.
Bucket of Water
Age 11 to 14
ShortChallenge Level 
Lisa's bucket 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.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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