TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: gopi gives rs . 90 plus one turban as salary to his servant for one year . the servant leaves after 9 months and receives rs . 60 and the turban . find the price of the turban .

SOLUTION: 30

PROBLEM: Problem: 13 buckets of water fill a tank when the capacity of each bucket is 42 litres . how many buckets will be needed to fill the same tank , if the capacity of each bucket is 6 litres ?

SOLUTION: 91

PROBLEM: Problem: find the least number of complete years in which a sum of money put out at 50 % compound interest will be more than double of itself ?

SOLUTION:
2