The task is to generate the correct answer for a given math problem.
--------
Question: Problem: arjun started a business with rs . 20,000 and is joined afterwards by anoop with rs . 80 , 000 . after how many months did anoop join if the profits at the end of the year are divided equally ?

Answer: 9

Question: Problem: a train covers a distance of 12 km in 10 minutes . if it takes 8 seconds to pass a telegraph post , then the length of the train is

Answer: 160 m

Question: Problem: | x + 3 | | 4 - x | = | 9 + x | how many solutions will this equation have ?

Answer:
1