The task is to generate the correct answer for a given math problem.

Q: Problem: if | x - 9 | = 3 x , then x = ?

A: - 4.
****
Q: Problem: the number of positive integer solutions for the equation x + y + z + t = 30 is

A: 3654
****
Q: Problem: steve traveled the first 2 hours of his journey at 40 mph and the last 3 hours of his journey at 100 mph . what is his average speed of travel for the entire journey ?

A:
76 mp
****