Question 77
Distinct prime numbers $p$, $q$, $r$ satisfy the equation
$$
2 p q r + 50 p q = 7 p q r + 55 p r = 8 p q r + 12 q r = A
$$
for some positive integer $A$. Find $A$.
$$
2 p q r + 50 p q = 7 p q r + 55 p r = 8 p q r + 12 q r = A
$$
for some positive integer $A$. Find $A$.