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]: Calculate prob of picking 1 v and 1 w when two letters picked without replacement from twtttvtqt.
[EX A]: 1/36

[EX Q]: Two letters picked without replacement from {t: 1, z: 1, v: 1, b: 1, s: 1, p: 2}. What is prob of picking 1 t and 1 p?
[EX A]: 2/21

[EX Q]: Let o(b) = 2*b. Let t be o(2). Let u(q) = -8 - q + 5 + t. Let n be u(-1). Solve n*m + w + 2 = 0, -3*m + 4*w - 7 = -6*m for m.
[EX A]:
-3