a) $6:7 = \frac{6}{7}$ ; $7:9 = \frac{7}{9}$
$5:4 = \frac{5}{4}$ ; $11:4 = \frac{{11}}{4}$
b) $9:3 = \frac{9}{3} = 3$
$12:6 = \frac{{12}}{6} = 2$
$24:8 = \frac{{24}}{8} = 3$
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