TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: 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 ?

SOLUTION: 2 / 5

PROBLEM: Problem: what decimal fraction is 90 ml of a litre ?

SOLUTION: . 09

PROBLEM: Problem: the average of 50 numbers id 20 . if two numbers , namely 45 and 55 are discarded , the average of the remaining numbers is :

SOLUTION:
18.7