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

Ex Input:
Problem: a store sells chairs and tables . if the price of 2 chairs and 1 table is 60 % of the price of 1 chair and 2 tables , and the price of 1 table and 1 chair is $ 72 , what is the price , in dollars , of 1 table ? ( assume that every chair has the same price and every table has the same price . )

Ex Output:
63

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

Ex Output:
4615

Ex Input:
Problem: a train 200 m long can cross an electric pole in 20 sec and then find the speed of the train ?

Ex Output:
3