[tex]x + \frac{10}{100} \times x = y(pretu \: dupa \: prima \: scumpire) \\ y + \frac{10}{100} \times y = 605 \\ y + \frac{y}{10} = 605 \\ \frac{y}{1} + \frac{y}{10} = \frac{605}{1} \\ \frac{10y}{10} + \frac{y}{10} = \frac{6050}{10} \\ \frac{11y}{10} = \frac{6050}{10} \\ 11y = 6050 \\ y = 6050 \div 11 \\ y = 550 \\ x + \frac{x}{10} = 550 \\ \frac{x}{1} + \frac{x}{10} = \frac{550}{1} \\ \frac{10x}{10} + \frac{x}{10} = \frac{5500}{10} \\ \frac{11x}{10} = \frac{5500}{10} \\ 11x = 5500 \\ x = 500(pretul \: initial)[/tex]
Coroniță??
