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).

[EX Q]: What is the least common multiple of 40 and 2 - (-52)/(-28) - 209/(-7)?
[EX A]: 120

[EX Q]: Evaluate (-16)/(-5) - 4/1.
[EX A]: -4/5

[EX Q]: Calculate prob of picking 2 o and 2 k when four letters picked without replacement from {o: 3, k: 12}.
[EX A]:
66/455