Question:
The greatest common divisor of positive integers $m$ and $n$ is 6. The least common multiple of $m$ and $n$ is 126. What is the least possible value of $m+n$?

Answer:
Since the GCD of $m$ and $n$ is 6, $m = 6x$ and $n = 6y$ for some integers $x$ and $y$.  Note that minimizing $m + n = 6x + 6y = 6(x + y)$ is equivalent to minimizing $x + y$.

The LCM of $m$ and $n$ is $126=2\cdot3^2\cdot7= 6 \cdot 3 \cdot 7$, so one of $x$ and $y$ is divisible by 3 and one is divisible by 7.  Then we can minimize $x + y$ by setting $x$ and $y$ to be 3 and 7 in some order.  Therefore, the least possible value of $m+n$ is $6(3 + 7) = \boxed{60}$.