Step-by-step explanation:
[tex]B \div 27 = \frac{5}{7} \\ \\ \therefore \: \frac{B}{27} = \frac{5}{7} \\ \\ \therefore \:B = \frac{5}{7} \times 27 \\ \\ \therefore \:B = \frac{135}{7} \\ \\ \therefore \:B = 19\frac{2}{7} \\ [/tex]
