If $a:b = 2:3$ and $b:c = 4:5$, then $a:b:c$ is

Question

Aicharya · Accepted Answer

Match $b$: scale first by $4$ to get $a:b = 8:12$, scale second by $3$ to get $b:c = 12:15$. So $a:b:c = 8:12:15$.

Solution