Question

if A:B=4:5 and B:C=10:17 then A:C is

Answer 1

$\frac{a}{b} = \frac{4}{5} \\ \frac{b}{c} = \frac{10}{17} \\ \frac{a}{c} = \frac{ \frac{a}{b} }{ \frac{c}{b} } = \frac{ \frac{4}{5} }{ \frac{17}{10} } = \frac{8}{17}$
hope it will help you.