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: Calculate prob of picking 2 n and 2 o when four letters picked without replacement from {o: 17, n: 3}.

Answer: 8/95


Question: Solve 0 = 4*y + 5*t - 15, 17 = 4*y - t + 4*t for y.

Answer: 5


Question: What is 2870.1 litres in millilitres?

Answer:
2870100