Question

Calcule o valor de b e c, onde b/4 = c/2 e b+c = 90. Marque a questão que corresponde aos valores de b e c.

Answer 1

$\frac{b}{4} = \frac{c}{2},\ multiplicando\ por\ 2\ temos:\\\\ \frac{b}{2} = c},\ logo:\\\\ b = 2c.\\\\ Temos\ tambem\ que\ b+c = 90.\ Entao:\\\\ Se\ b = 2c:\\\\ 2c + c = 90\\ 3c = 90\\ c = 90/3\\ c= 30.\\\\ Lembrando\ que\ b = 2c\ e\ que\ c = 30, logo:\\\\ b = 2.30\\ b = 60.\\\\\\\\;)$

Answer 2

b/4 = c/2
b+c = 90.

 b = c ==> b + c =  90  = 15
 4    2        4 + 2      6

b = 15 ==> b = 15.4 ==> b = 60
4

c = 15 ==> c = 15.2 ==> c = 30
2