Question

1) Determine a medida x do segmento AB, sabendo que AB/BC = 2/5 e BC = 20 cm........

Answer 1

$\frac{AB}{BC} = \frac{2}{5} \\ \\ \frac{AB}{20} = \frac{2}{5} \\ \\ 5AB = 40 \\ \\ AB = 8~cm$