The task is to generate the correct answer for a given math problem.
--------
Question: Problem: a cat chases a rat 6 hours after the rat runs . cat takes 4 hours to reach the rat . if the average speed of the cat is 90 kmph , what s the average speed of the rat ?

Answer: 36 kmph


Question: Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?

Answer: 30 %


Question: Problem: the standard deviation of a normal distribution of data is 2 , and 3 standard deviations below the mean is greater than 48 . what is a possible value for the mean of the distribution ?

Answer:
55