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Double 15 is equal to 30
Ah, double fifteen point five is simply thirty-one. You see, when you double fifteen, you get thirty, and when you add half of fifteen, which is point five, you get thirty-one. It's a lovely number, just like a happy little tree in a peaceful meadow.
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15
5+5 = 10 10+5 = 15 15-5 = 15 10+5 = 15