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]: Two letters picked without replacement from jbbfbbbfffo. What is prob of sequence jf?
[EX A]: 2/55

[EX Q]: Four letters picked without replacement from wkakwuuwuuukwwuuwuu. Give prob of picking 3 w and 1 a.
[EX A]: 5/969

[EX Q]: Suppose 2*c = 6*c + 36. Let j = 11 + c. Solve -2*q - 4 = -2*x, -j*x - 4*q + 20 = 4 for x.
[EX A]:
4