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

Input: Consider Input: Problem: a solution contains 8 parts of water for every 7 parts of lemonade syrup . how many parts of the solution should be removed and replaced with water so that the solution will now contain 25 % lemonade syrup ?

Output: 2.14

Input: Consider Input: Problem: the sum of the even numbers between 1 and n is 89 * 90 , where n is an odd number , then n = ?

Output: 179

Input: Consider Input: Problem: in a group of 7 boys and 8 girls , 5 members are to be selected . in how many different ways can they be selected such that at least 3 boys should be there ?
Output: 1281