Найдите 30% значения выражения (6 4\5 - 2 3\4) : (2 16\21 + 3 2\3)

Решите задачу:

$(6 \frac{4}{5} - 2 \frac{3}{4} ) \div (2 \frac{16}{21} + 3 \frac{2}{3} ) = (4 \frac{16 - 15}{20} ) \div (5 \frac{16 + 14}{21} ) = 4 \frac{1}{20} \div 5 \frac{30}{21} = 4 \frac{1}{20} \div 6 \frac{3}{7} = \frac{81}{20} \div \frac{45}{7} = \frac{81 \times 7}{45 \times 20} = \frac{63}{100} \\ \frac{63}{100} \times 0.3 = \frac{63 \times 3}{100 \times 10} = \frac{189}{1000}$