Discussion Forum

If $a:b=5:9$ and $b:c=4:7$, find $a:b:c$.

Answer:

Explanation:

$a:b=5:9$ and $b:c= 4:7$

$b:c$ $=\left(4\times\frac{9}{4}\right):\left(7\times\frac{9}{4}\right)$ $=9:\left(\frac{63}{4}\right)$

$a:b:c =5:9:\left(\frac{63}{4}\right)$ $= 20:36:63$.