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: Let p be (0 - 2 - -3) + 0. Let u = -157/4 - -41. What is the common denominator of u and p + 143/(-6) + 2?

Answer: 12


Question: Three letters picked without replacement from oxccztxcccocottcxxto. Give prob of picking 2 o and 1 t.

Answer: 2/95


Question: What is 25/2 of a litre in millilitres?

Answer:
12500