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16)
$124 \div (3 \frac{7}{45} - \frac{2}{5} ) = 124 \div ( \frac{142}{45} - \frac{2}{5} ) = 124 \div ( \frac{142}{45} - \frac{18}{45} ) = 124 \div \frac{124}{45} = 124 \times \frac{45}{124} = 45$
17)
$75.6 \div (2 \frac{24}{35} - \frac{2}{7}) = 75 \frac{6}{10} \div ( \frac{94}{35} - \frac{2}{7} ) = 75 \frac{3}{5} \div ( \frac{94}{35} - \frac{10}{35} ) = \frac{378}{5} \div \frac{84}{35} = \frac{378}{5} \times \frac{35}{84} = \frac{9 \times 7}{1 \times 2} = \frac{63}{2} = 31.5$
18)
$118 \div (3 \frac{41}{70} - \frac{3}{14} ) = 118 \div ( \frac{251}{70} - \frac{3}{14} ) = 118 \div ( \frac{251}{70} - \frac{15}{70} ) = 118 \div \frac{236}{70} = 118 \times \frac{70}{236} = \frac{70}{2} = 35$
19)
$191 \div (2 \frac{1}{70} - ( - \frac{5}{7} )) = 191 \div ( \frac{141}{70} + \frac{5}{7} ) = 191 \div ( \frac{141}{70} + \frac{50}{70} ) = 191 \div \frac{191}{70} = 191 \times \frac{70}{191} = 70$