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: solution y is 30 percent liquid x and 70 percent water . if 2 kilograms of water evaporate from 6 kilograms of solution y and 2 kilograms of solution y are added to the remaining 4 kilograms of liquid , what percent of this new solution is liquid x ?

SOLUTION: 40 %

PROBLEM: Problem: if 45 - [ 28 - { 37 - ( 15 - * ) } ] = 54 , then * is equal to :

SOLUTION:
15