instruction:
Given a simple high-school level math question, you are required to solve it and provide the final answer. The final answer is always a single number. These questions can range from a variety of topics like simple arithmetic, solving equations, converting a quantity from one unit to another, finding remainders/GCD/LCM, finding probabilities etc. Each question has only one correct answer. This answer can be a positive or negative integer, a fraction or a decimal number. If the answer is a negative number use the hyphen (e.g. -42) symbol for the minus sign. For decimal numbers, do not add extra zeros after the decimal point. For fractional numbers, separate the numerator and denominator using a forward slash (e.g. 3/25).
question:
Suppose 2*n + 2*n = 4. Suppose -n = f - 2. What is the highest common divisor of f and 5?
answer:
1


question:
15 + (7 + -17)/1
answer:
5


question:
Calculate prob of sequence fffm when four letters picked without replacement from fffffmmmmmmmm.
answer:

4/143