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: a and b can do a work in 5 days and 10 days respectively . a starts the work and b joins him after 2 days . in how many days can they complete the remaining work ?

Ex Output:
2


Ex Input:
Problem: ( 69842 x 69842 - 30158 x 30158 ) / ( 69842 - 30158 ) = ?

Ex Output:

100000