Question

help help help....

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Answer 1

15- x / 3+ x = 1/5

let cross multiply,

5(15-x) = 1(3 + x)

75 - 5 x = 3+ x

75 - 3 = x+5x

72 = 6 x

72/6 = x

x = 12

Answer 2

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Answer...

$\frac{15 \: - \: x}{3 + x } = \frac{1}{5} \\ \\ 5(15 - x) = 3 + x \\ \\ 75 - 5x \: = 3 + x \\ \\ 75 - 3 = 5x + x \\ \\ 72 = 6x \\ \\ x \: = 12$

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