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

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 ?
14

Problem: every year an amount increases by 1 / 8 th of itself . how much will it be after two years if its present value is rs . 70400 ?
89100

Problem: a train 310 m long is running at a speed of 45 km / hr . in what time will it pass a bridge 140 m long ?
36