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

Ex Input:
Problem: find the cost of fencing around a circular field of diameter 16 m at the rate of rs . 3 a meter ?

Ex Output:
150.84


Ex Input:
Problem: if 32.5 % of the 880 students at a certain college are enrolled in biology classes , how many students at the college are not enrolled in a biology class ?

Ex Output:
594


Ex Input:
Problem: the length of the rectangular field is double its width . inside the field there is square shaped pond 6 m long . if the area of the pond is 1 / 8 of the area of the field . what is the length of the field ?

Ex Output:

24