11.
[tex]\frac{8}{10} = \frac{4}{6}[/tex]
8(6) = 4(10)
48 = 40 (not equal)
12.
[tex]\frac{12}{15} = \frac{4}{5}[/tex]
12(5) = 4(15)
60 = 60 (equal)
13.
[tex]\frac{18}{n} = \frac{21}{28}[/tex]
18(28) = 21n
504 = 21n
n = 24
14.
[tex]\frac{12}{16} = \frac{n}{64}[/tex]
12(64) = 16n
768 = 16n
n = 48
15. 6:4 or 3:2
16.
[tex]\frac{5}{7} = \frac{x}{14}[/tex]
5(14) = 7x
70 = 7x
x = 10
