Question

Daca x/y=2/3 si 3x+5y=42 aflati x+y

Answer 1

$\frac{x}{y} = \frac{2}{3} = > 3x = 2y$

$3x + 5y = 42 \\ 2y + 5y = 42 \\ 7y = 42 = > y = 6 \\ 3x = 2 \times 6 \\ 3x = 12 = > x = 4 \\ \\ x + y = 4 + 6 = > x + y = 10$