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

Ex Input:
Problem: a car gets 24 miles to the gallon . if it is modified to use a solar panel , it will use only 75 percent as much fuel as it does now . if the fuel tank holds 12 gallons , how many more miles will the car be able to travel , per full tank of fuel , after it has been modified ?

Ex Output:
96


Ex Input:
Problem: how many quarters are equal to 7 dollars ?

Ex Output:
28


Ex Input:
Problem: p , q and r together earn rs . 1890 in 9 days . p and r can earn rs . 600 in 5 days . q and r in 7 days can earn rs . 910 . how much amount does r can earn per day ?

Ex Output:

s . 40