Question

Os numeros x,y e 32 sao diretamente proporcionais aos números 40,72,128,quais sao os números x e y?

Answer 1

$\frac{x}{40} = \frac{y}{72} = \frac{32}{128} \\ \\ simplificando~~ \frac{32:32}{128:32} = \frac{1}{4} \\ \\ logo \\ \\ \frac{x}{40} = \frac{1}{4} ~~~~~~~~~~~~~~~~~~ \frac{y}{72} = \frac{1}{4} \\ \\ 4x=40~~~~~~~~~~~~~~~~4y=72 \\ x=40\div4~~~~~~~~~~~~~y=72\div4 \\ x=10~~~~~~~~~~~~~~~~~~~y=18$