The task is to generate the correct answer for a given math problem.

Ex Input:
Problem: of the seven - digit positive integers that have no digits equal to zero , how many have two digits that are equal to each other and the remaining digit different from the other two ?

Ex Output:
152409600


Ex Input:
Problem: sachin is older than rahul by 7 years . if the ratio of their ages is 11 : 9 , find the age of sachin

Ex Output:
38.5


Ex Input:
Problem: a factory produces 6400 toys per week . if the workers at this factory work 3 days a week and if these workers make the same number of toys everyday , how many toys are produced each day ?

Ex Output:

2133 toys