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17 January, 02:07

Bread and sugar cost 110 together, bread cost 100 more than sugar, how much does sugar cost?

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  1. 17 January, 02:29
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    First write an equation system based on the problem

    We can write " Bread and sugar cost 110 together" as

    ∴ b + s = 110

    We can write " bread cost 100 more than sugar" as

    ∴ b = 100 + s

    Second, solve the equation system by subtitution method

    Subtitute b with (100+s) in the first equation, and we'll find the value of s

    b + s = 110

    (100 + s) + s = 110

    100 + 2s = 110

    2s = 110 - 100

    2s = 10

    s = 10/2

    s = 5

    The cost of the sugar is 5
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