13/9 : 5/6 : 7/15
= 13/9 x 6/5 x 7/15
= 546/675
\(\frac{13}{9}:\frac{5}{6}:\frac{7}{15}=\frac{26}{7}\)
\(\frac{13}{9}:\frac{5}{6}:\frac{7}{15}=\frac{13}{9}\times\frac{6}{5}\times\frac{15}{7}=\frac{26}{15}\times\frac{15}{7}=\frac{26\times15}{15\times7}=\frac{26}{7}\)