Question

Na figura a // b // c. Qual é o valor de x?

Answer 1

$\boxed{\begin{array}{l}\sf\dfrac{x}{y}=\dfrac{5}{9}\\\sf\dfrac{x}{5}=\dfrac{y}{9}=k\implies x=5k~~y=9k\\\sf x+y=28\\\sf5k+9k=28\\\sf14k=28\\\sf k=\dfrac{28}{14}\\\sf k=2\\\sf x=5k\\\sf x=5\cdot2\\\sf x=10\end{array}}$