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).

Example Input: Let d = -25 - -162. What is the tens digit of d?
Example Output: 3

Example Input: What is prob of picking 3 m when three letters picked without replacement from ymyymtmyyymvymmvyymm?
Example Output: 14/285

Example Input: Suppose 2*c + 9 = -3. Let o = c - -4. Let b be (o/5)/(2/(-10)). Calculate the highest common divisor of 5 and b.
Example Output:
1