Verified answer

Resposta:

a) [tex]\frac{1}{4} = \frac{2}{x}[/tex]

[tex]\frac{1}{4}[/tex] x [tex]\frac{2}{x} \\[/tex]
1x= 2*4
1x = 8
x=8/1
x=8

b)[tex]\frac{2}{3} = \frac{x}{21}[/tex]
[tex]\frac{2}{3}[/tex] x [tex]\frac{x}{21} \\[/tex]
3x=2*21
3x=42
x=21/3
x=7

c) [tex]\frac{x}{10} = \frac{6}{10}[/tex]
[tex]\frac{x}{10}[/tex] x [tex]\frac{6}{10} \\[/tex]
10x=10*6
10x=60
x=60/10
x=6