6. Решите уравнение а) x : 8 = 15 : 30, б) \(\frac{x}{7}\) = \(\frac{5}{2}\)

а) x : 8 = 15 : 30 x : 8 = \(\frac{1}{2}\) x = 8 * \(\frac{1}{2}\) x = 4 б) \(\frac{x}{7}\) = \(\frac{5}{2}\) x = \(\frac{5}{2}\) * 7 x = \(\frac{35}{2}\) x = 17,5