I need help with a math homework problem...?

A man selling fruit has only 3 weights, but with them he can weigh any whole number of kilograms from 1kg to 13kg inclusive on his balance scale. What weights does he have?

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  • 1 decade ago
    Favorite Answer

    1...3....9

    1=1

    3-1=2

    3=3

    3+1=4

    9-3-1=5

    9-3=6

    9-3+1=7

    9-1=8

    9=9

    9+1=10

    9+3-1=11

    9+3=12

    9+3+1=13

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  • 1 decade ago

    1, 3 and 9

    because:

    1 = 1

    2 = 3-1

    3 = 3

    4 = 3+1

    5 = 9 - 3 - 1

    6 = 9 - 3

    7 = 9 - 3 + 1

    8 = 9 - 1

    9 = 9

    10 = 9 + 1

    11 = 9 + 3 -1

    12 = 9 + 3

    13 = 9 + 3 + 1

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  • 1 decade ago

    1 9 and 2

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  • Anonymous
    1 decade ago

    a scale?

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