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Better Spelling
Age 11 to 14
ShortChallenge Level 
In Emily's first spelling test, she scored 1 mark out of 5, so she decided to work really hard to improve her scores.
If she scores full marks (5 out of 5) in all her tests after the first, how many more tests does she need to take, in order to increase her average to more than $80$%?
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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