1.

If (x-9) : (3x+7) is a duplicate ratio of 4:9 ,find x

Answer» HOLA User!!

Your answer :-


= > \frac{(x - 9)}{(3x + 7)} = \frac{4}{9} \\ \\ by \: cross \: multiplication \\ \\ = > 9(x - 9) = 4(3x + 7) \\ \\ = > 9x - 81 = 12x + 28 \\ \\ = > 9x - 12x = 28 + 81 \\ \\ = > - 3x = 109 \\ \\ = > x = \frac{109}{ - 3} \\ \\ = > x = \frac{ - 109}{3}

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