Question

$\dfrac{x}{\dfrac{30-x}{30.2}} =12$

Answer 1

Resposta:

$x=\frac{1800}{211}$

Explicação passo-a-passo:

$\dfrac{x}{\dfrac{30-x}{30.2}} =12\\\\\\x.\frac{30,2}{30-x} =12\\30,2x=12(30-x)\\30,2x=360-12x\\(30,2+12)x=360\\42,2x=360\\\\x=\frac{360}{42,2} =\frac{360}{\frac{422}{10} } =\frac{3600}{422}= \frac{3600\div2}{422\div2}= \frac{1800}{211}$