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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

What is the number if the difference between the two digits is 3 and the number is square (If you have forgotten what a square number is: You make a square number when you multiply something by itself, so 49 is square because it is 7 times 7)

Answer: 25 or 36