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Step-by-step explanation:

[tex] \frac{4.8}{1 \frac{7}{9} } = (1.2b) \div 6 \frac{2}{3} [/tex]

[tex] \frac{ \frac{48}{10} }{ \frac{16}{9} } = \frac{12b}{10} \div \frac{20}{3} [/tex]

[tex] \frac{48 \times 9}{10 \times 16} = \frac{12b}{10} \times \frac{3}{20} [/tex]

[tex] \frac{432}{160} = \frac{36b}{200} [/tex]

[tex]432 \times 200 = 160 \times 36b[/tex]

[tex]86400 = 5760b[/tex]

[tex]b = \frac{86400}{5760} [/tex]

[tex]b = 15[/tex]