Question

40supra100 ori x + 90 = x dau coronita

Answer 1

$\frac{40}{100} \times x + 90 = x \\ \\ \frac{2}{5}x + 90 = x \\ \\ \frac{2x}{5} + 90 = x \\ \\ 2x + 450 = x \\ \\ 450 = 5x - 2x \\ \\ 450 = 3x \\ \\ \frac{450}{3} = x \\ \\ 150 = x \\ \\ x = 150$