instruction:
The task is to generate the correct answer for a given math problem.
question:
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 ?
answer:
2.14


question:
Problem: a train 200 m long can cross an electric pole in 5 sec and then find the speed of the train ?
answer:
144


question:
Problem: how many different positive integers exist between 10 ^ 3 and 10 ^ 4 , the sum of whose digits is equal to 2 ?
answer:

4