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

Ex Input:
Problem: a train 200 m long can cross an electric pole in 5 sec and then find the speed of the train ?

Ex Output:
144

Ex Input:
Problem: a person was asked to subtract 25 % of a number from the original but he subtracted 25 from the number . his answer was 25 more than correct one . what was the original number ?

Ex Output:
200

Ex Input:
Problem: he average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 70 kg . what might be the weight of the new person ?

Ex Output:
90 kg