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

Input: Consider Input: Problem: two trains travel in opposite directions at 36 kmph and 45 kmph and a man sitting in slower train passes the faster train in 12 seconds . the length of the faster train is

Output: 270 m

Input: Consider Input: Problem: a statue is being carved by a sculptor . the original piece of marble weighed 180 kg . in the first week 28 percent is cut away . in the second week 18 percent of the remainder is cut away . in the third week the statue is completed when 20 percent of the remainder is cut away . what is the weight of the final statue ?

Output: 85 kg

Input: Consider Input: Problem: if a a b = 2 a - 3 b + ab , then 3 a 2 + 2 a 3 is equal to :
Output: 7