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Answer: 21
18 + 15 + 11 + 14 = 58
10 + 11 + 17 = 38, 20 missing to make 58
18 + 13 + 20 = 51, 7 missing to make 58
7 + 16 + 14 = 37, 21 missing to make 58
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.