[tex] \frac{81}{10} \div \frac{9}{25} = \frac{81}{10} \times \frac{25}{9} = \frac{2025}{90} = 22 \frac{5}{6} [/tex]

[tex] 9 \frac{12}{25} \div 4 = 9 + \frac{12}{25} \div 4 = 9 + \frac{3}{25} = 9 \frac{3}{25} [/tex]

[tex] 3 \frac{3}{20} \div 1 \frac{2}{5} = 3 + \frac{3}{20} \div \frac{7}{5} = 3 + \frac{15}{140} = 3 \frac{3}{28} [/tex]

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