TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: the average age of 10 men is increased by years when two of them whose ages are 21 years and 23 years are replaced by two new men . the average age of the two new men is

SOLUTION: 3

PROBLEM: Problem: a can do a work in 15 days and b in 20 days . if they work on it together for 5 days , then the fraction of the work that is left is

SOLUTION: 5 / 12

PROBLEM: Problem: a train 50 m long takes 6 sec to cross a man walking at 5 kmph in a direction opposite to that of the train . find the speed of the train ?

SOLUTION:
25 kmph