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

Problem: a is half good a work man as b and together they finish a job in 14 days . in how many days working alone b finish the job ?
21

Problem: the population of a city is 415600 . it increased by 25 % in the first year and decreased by 30 % in the second year . what is the population of the city at the end of second year ?
363650

Problem: in what time will a railway train 60 m long moving at the rate of 36 kmph pass a telegraph post on its way ?
6