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

Example Input: Problem: in a room filled with 6 people , all 6 people have exactly 2 siblings in the room . if two individuals are selected from the room at random , what is the probability that those two individuals are not siblings ?
Example Output: 3 / 5

Example Input: Problem: at a certain fruit stand , the price of each apple is 40 cents and the price of each orange is 60 cents . mary selects a total of 30 apples and oranges from the fruit stand , and the average ( arithmetic mean ) price of the 30 pieces of fruit is 56 cents . how many oranges must mary put back so that the average price of the pieces of fruit that she keeps is 52 cents ?
Example Output: 1

Example Input: Problem: a man walking at a rate of 5 km / hr crosses a bridge in 15 minutes . the length of the bridge is ?
Example Output:
1250 m