1. The product of two odd numbers is 399.
What are they?
2. The difference between two square numbers is 9.
What are they?
3. The sum of three prime numbers is 19.
What are they?
4. The ratio of two even numbers is 5:7.
What are they?
Topics: Starter  Arithmetic  Number  Puzzles  Ratio
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1. 1 and 399 or 3 and 133 or 7 and 57 or 19 and 21 (and their negatives).
2. 16 and 25. Could there be any other solutions?
3. 3, 3 and 13 or 3, 5 and 11 or 5, 7 and 7.
4. 10 and 14 or 20 and 28 or 30 and 42 or ...
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