The task is to generate the correct answer for a given math problem.
--------
Question: Problem: solve the equation for x : 6 x - 47 + 3 x = 4 + 9 - x

Answer: 


Question: Problem: the average weight of a group of boys is 30 kg . after a boy of weight 45 kg joins the group , the average weight of the group goes up by 1 kg . find the number of boys in the group originally ?

Answer: 14


Question: Problem: a group of men decided to do a work in 55 days , but 15 of them became absent . if the rest of the group did the work in 60 days , find the original number of men ?

Answer:
180