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).
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Question: What is prob of picking 1 f and 2 n when three letters picked without replacement from {d: 1, f: 1, a: 2, n: 13}?

Answer: 39/340


Question: Suppose p - 4*p = 0. Suppose -4*v + 0*v + 17 = -l, 4*l + 4 = p. Suppose -3*m + 55 = -17. Solve -5*r + v = m for r.

Answer: -4


Question: Let c = -4 - -6. Suppose -3*p + c*t = -7*p + 26, 3*t - 29 = -4*p. What is the smallest common multiple of (-22)/(-6) + (-1)/(-3) and p?

Answer:
20