The task is to generate the correct answer for a given math problem.
--------
Question: Problem: how many seconds will a train 120 meters long take to cross a bridge 150 meters long if the speed of the train is 36 kmph ?

Answer: 27 sec


Question: Problem: what is the sum of natural numbers between 30 and 100

Answer: 4615


Question: Problem: a pupil ' s marks were wrongly entered as 85 instead of 33 . due to that the average marks for the class got increased by half . the number of pupils in the class is :

Answer:
104