Troubling Doubling at SchoolMath brain teasers require computations to solve.Read the little poem and answer its question if you can.
The number of girls who do wear a watch is double the number who don't. But the number of boys who do not wear a watch is double the number who do. If I tell you the number of girls in my class is double the number of boys, Can you tell me the number I teach? Here's a clue: More than 20; below 32! 
Answer27Solution: The number of boys must be a multiple of 3 (3, 6, 9...) so that it can be split in the ratio of 2:1 (no watch:watch). The number of girls is double the no. of boys (6, 12, 18...) So the totals can only be 9, 18, 27... Hide What Next?
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