Question

ajudem gente por favor !!!​

Answer 1

$a + b = 55 \\ \\ \frac{a}{b} = \frac{4}{7} \\ \\ \frac{7a = 4b}{7b} \\ \\ a = \frac{4b}{7} \\ a + b = 55 \\ \frac{4b}{7} + 5 = 55 \\ \frac{4b +7b = 385 }{7} \\ {11b} = 385 \\ b = 35 \\ a = 20$

R= A vale 20 e B vale 35