Question 85
Let $a$, $b$, $c$ be positive integers such that
$$
\frac{a}{77} + \frac{b}{91} + \frac{c}{143} = 1
$$
What is the smallest possible value of $a + b + c$?
$$
\frac{a}{77} + \frac{b}{91} + \frac{c}{143} = 1
$$
What is the smallest possible value of $a + b + c$?