Question

(sexta série)
Calcule o valor de x nas proporçoes ::
a) x/5= 6/10


b) 3/7= 60/x


c) 6/x = 14/35


d) 7/6 = 42/x


e) 35/25 = 30/x


f) 2x/15=6/9


g) 2x/3=3/6

Answer 1

a) $\frac{x}{5}= \frac{6}{10}$
    $10x = 30 -->x = 3$

b) $\frac{3}{7}= \frac{60}{x}$
     3x = 420 --> x = 140

c) $\frac{6}{x}= \frac{x14}{35}$
    14x = 6 . 35 -->14x = 210 --> x=15

d) $\frac{7}{6}= \frac{42}{x}$
   7x = 6. 42--> 7x = 252 --> x = 36

e) $\frac{35}{25}= \frac{30}{x}$
   35x = 30 .25 -->35x = 750 --> x = $\frac{750}{35}= \frac{150}{7}$

f) $\frac{2x}{15}= \frac{6}{9}$
    9. 2x = 6. 15-->18x = 90 --> x = 5

g) $\frac{2x}{3}= \frac{3}{6}$
    6. 2x= 3. 3--> 12x = 9 --> x=9/12 -->x =3/4