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100 children took part in a Mathematics competition consisting of four problems.
90 children solved the first problem
85 solved the second
80 solved the third
75 solved the last problem
What is the minimum number of children who could have answered all the questions correctly?
This problem is taken from the UKMT Mathematical Challenges.
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Age 11 to 14
ShortChallenge Level 
100 children took part in a Mathematics competition consisting of four problems.
90 children solved the first problem
85 solved the second
80 solved the third
75 solved the last problem
What is the minimum number of children who could have answered all the questions correctly?
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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