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16 December, 19:44

The sum of two numbers is 21. One number is three less that the other. Find the numbers.

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  1. 16 December, 22:47
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    12+9=21 because 12-3=9 and 9+12 is 21
  2. 16 December, 23:03
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    If you look at clue #2 first then you see that if you know one of the numbers then the other number is 3 less than it, so if I let one of the numbers be x then the other is

    x - 3. Now clue # 1 says the sum of the two numbers is 21 so

    x + (x - 3) = 21
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