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

Example Input: Problem: how many numbers between 200 and 600 are divisible by 4 , 5 and 6 ?
Example Output: 6

Example Input: Problem: for a certain art exhibit , a museum sold admission tickets to a group of 50 people every 5 minutes from 9 : 00 in the morning to 5 : 55 in the afternoon , inclusive . the price of a regular admission ticket was $ 10 and the price of a student ticket was $ 6 . if on one day 3 times as many regular admission tickets were sold as student tickets , what was the total revenue from ticket sales that day ?
Example Output: $ 4860

Example Input: Problem: my grandson is about as many days as my son in weeks , and my grandson is as many months as i am in years . my grandson , my son and i together are 120 years . can you tell me my age in years ?
Example Output:
72