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: What is prob of picking 1 u and 3 h when four letters picked without replacement from {r: 3, m: 4, h: 3, u: 1}?
Example Output: 1/330

Example Input: Calculate the least common multiple of 21 and (-3 - 7/(-2))*10.
Example Output: 105

Example Input: How many millilitres are there in 67062.81l?
Example Output:
67062810