a)

$3:5=\frac{3}{5}$

$1:6=\frac{1}{6}$

$2:7=\frac{2}{7}$

b)

$7:10=\frac{7}{10}$

$3:15=\frac{3}{15}$

$9:20=\frac{9}{20}$

c)

$10:21=\frac{10}{21}$

$26:100=\frac{26}{100}$

$1:12=\frac{1}{12}$

d)

$2:3=\frac{2}{3}$

$10:35=\frac{10}{35}$

$18:30=\frac{18}{30}$

e)

$8:18=\frac{8}{18}$

$9:25=\frac{9}{25}$

$2:25=\frac{2}{25}$