\"\"

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Using a proportion that relates the values.

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\"\"                   (Direct proportion)

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\"\"                     (Substitute \"\")

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\"\"                     (Apply Cross multification)

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\"\"

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\"\"                     (Simplify)

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\"\"                (Divide each side by 2)

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\"\"                       (Simplify)

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Therefore, \"\" the value of y is 15.

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\"\"

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The value of y is 15.