Question

revolva a seguinte proporcao 5x+3/10= 21/30

Answer 1

Resposta:

$\frac{5x + 3}{10} = \frac{21}{30} \\ (5x + 3) \times 30 = 21 \times 10 \\ 150x + 90 = 210 \\ 150x = 210 - 90 \\ 150x = 120 \\ x = \frac{120}{150} = \frac{12}{15} = \frac{4}{5}$