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 student chose a number , multiplied it by 2 , then subtracted 138 from the result and got 102 . what was the number he chose ?
answer:
120


question:
Problem: the sum of the ages of 5 children born at the intervals of 3 year each is 50 year . what is the age of the youngest child ?
answer:

4 year