Question:
If the least common multiple of $A$ and $B$ is $1575$, and the ratio of $A$ to $B$ is $3:7$, then what is their greatest common divisor?

Answer:
Since the ratio of $A$ to $B$ is $3:7$, there is an integer $k$ for which $A=3k$ and $B=7k$. Moveover, $k$ is the greatest common divisor of $A$ and $B$, since 3 and 7 are relatively prime. Recalling the identity $\mathop{\text{lcm}}[A,B]\cdot\gcd(A,B)=AB$, we find that $1575k=(3k)(7k),$ which implies $k=1575/21=\boxed{75}$.