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

[EX Q]: Problem: the ratio of a to b is 4 to 5 , where a and b are positive . if x equals a increased by 25 percent of a , and m equals b decreased by 60 percent of b , what is the value of m / x ?
[EX A]: 2 / 5

[EX Q]: Problem: if the sides of a triangle are 26 cm , 24 cm and 15 cm , what is its area ?
[EX A]: 180

[EX Q]: Problem: a certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour . if the car had started with a full tank and had 6 gallons of gasoline left in its tank at the end , then what percent of the tank was used to travel 80 miles at 60 mph ?
[EX A]:
25 %