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

Example Input: Problem: from a pack of cards , two cards are drawn one after the other , with replacement . what is the probability that the first card is a black card and the second card is a king ?
Example Output: 1 / 26

Example Input: Problem: elvin ' s monthly telephone bill is the sum of the charge for the calls he made during the month and a fixed monthly charge for internet service . elvin ' s total telephone bill for january was $ 46 and elvin ' s total telephone bill for february was 76 $ . if elvin ' s charge for the calls he made in february was twice the charge for the calls he made in january , what is elvin ' s fixed monthly charge for internet service ?
Example Output: $ 16

Example Input: Problem: the value of 3.6 x 0.48 x 2.50 / 0.12 x 0.09 x 0.5 is
Example Output:
800