Question

qual é a proporçao entre 50/(2x+90)= 31/(3x+3)?

Answer 1

$\frac{50}{2x+90}=\frac{31}{3x+3}$
$50(3x+3)=31(2x+90)$
$150x+150=62x+2790$
$88x=2640$
$x=\frac{2640}{88}=\frac{1320}{44}=\frac{660}{22}=\frac{330}{11}=\boxed{30}$

Answer 2

50.(3x + 3) = 31.(2x + 90) 150x + 150 = 62x + 2790 150x - 62x = 2790 - 150 88x = 2640 x = 2640/88 x = 30