ching asked in 科學及數學數學 · 1 decade ago

Maths???F.1

A number plus 13 is equal to 3 times the result of the number minus 11.Find the number.

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  • 1 decade ago
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    Let the number be x

    The number plus 13 is x + 13

    The number minus 11 is x - 11

    THe number plus 13 is equal to 3 times the result of the number minus 11

    => x + 13 = 3(x - 11)

    => x + 13 = 3x - 33

    => 13 + 33 = 3x - x

    => 2x = 46

    => x = 23

    The number is 23

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