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5 April, 05:27

What is the sum of x + 9?

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  1. 5 April, 05:56
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    So 30/48=15 / (x+9)

    this could be easily solved by recognizing the proportion (the other way is usiing full algebra and doing multiply both sides by 48 (x+9) and then divide both sides by 30 then subtract 9)

    30 is 2 times of 15

    therefor 48 is 2 times of (x+9)

    48=2 times (x+9)

    divide both sides by 2

    24=x+9

    subtract 9

    15=x

    x=15
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