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! 
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