Discussion Forum

If $A:B=1:3$; $B:C=5:7$; $C:D=9:7$, then $A:B:C:D$ is equal to

Answer:

Explanation:

$A:B:C:D$ $=1\times 5\times 9:3\times 5\times 9:3\times 7\times 9:3\times 7\times 7$

Taking $3$ as a common factor we get $15:45:63:49$.