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

Problem: the diameter of the driving wheel of a bus in 140 cm . how many revolutions per minute must the wheel make in order to keep a speed of 33 kmph ?
125

Problem: if the cost price of 50 articles is equal to the selling price of 40 articles , then the gain or loss percent is ?
25 %

Problem: there is enough provisions for 600 men in an army camp for 25 days . if there were 250 men less , how long will the provision last ?

60 days