Question

Encontre:
A) a e b ,se a+b=70 e a/b= 18/27


Me ajudem

Answer 1

a/b = 18/27

a . 27 = b . 18
a = 18.b /27
substituindo o valor de a fica:
a + b = 70
18 b / 27 + b = 70 m.m.c = 70
18 b/70 + 27 b /27 = 1890/27 eliminamos o denominador fica:
18 b + 27 b = 1890
45 b = 1890
b = 1890/45
b = 42
a + b = 70
a + 42 = 70
a = 70 - 42
a = 28
Resposta a = 28 e b = 42

Answer 2

$a + b = 70$
$\frac{18b}{27} + b = 70$
$\frac{18b+27b=1.890}{27} 18b+27b = 1.890 45b = 1.890 b = 42$

$\frac{a}{b} = \frac{18}{27} 27a = 18b$
$a= \frac{18b}{27}$
$a= \frac{18*42}{27}$
$a = 28$