Question

2 sobre 3 = 5 sobre X =

Answer 1

$\dfrac{2}{3} = \dfrac{5}{x}$

Multiplique cruzado.

$\dfrac{2}{3} = \dfrac{5}{x} \\ \\ 2x = 5 . 3 \\ \\ 2x = 15 \\ \\ \\ x = \dfrac{15}{2} \\ \\ \\ x = 7,5$