Question

4)determine o valor de X,em cada caso:​

Answer 1

a)

$\frac{x}{x + 2} = \frac{9}{12} \\ 12x = 9x + 18 \\ 12x - 9x = 18 \\ x = \frac{18}{3} \\ x = 6$

b)

$\frac{x}{15} = \frac{x + 4}{20} \\ 20x = 15x + 60 \\ x = \frac{60}{5} \\ x = 12$