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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.

A household has some goldfish, some canaries and some rabbits. Altogether there are 15 heads and 26 legs. How many of each animal could there be?

Answer: 3, 11 , 1;4, 9, 2; 5, 7, 3; 6, 5, 4; 7, 3, 5; 8, 1,