1. The product of two odd numbers is 209.
What are they?
2. The difference between two square numbers is 15.
What are they?
3. The sum of three prime numbers is 23.
What are they?
4. The ratio of two even numbers is 5:4.
What are they?
Topics: Starter  Arithmetic  Number  Puzzles  Ratio
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1. 1 and 209 or 11 and 19 (and their negatives).
2. 1 and 16 or 49 and 64. Could there be any other solutions?
3. 2, 2 and 19 or 3, 3 and 17 or 3, 7 and 13 or 5, 5 and 13 or 5, 7 and 11.
4. 10 and 8 or 20 and 16 or 30 and 24 or ...
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