Question

me ajudem, por favor.​

Answer 1

Espero ter ajudado.

$\frac{15}{45}=\frac{x}{30}\\\\\frac{x}{30}=\frac{15}{45}\\\\\frac{x}{30}\cdot \:10=\frac{15}{45}\cdot \:10\\\\\frac{x}{3}=\frac{10}{3}\\\\\frac{3x}{3}=\frac{10\cdot \:3}{3}\\\\x=10$