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: Let v = -7 - -11. Suppose 0 = 5*n + n - 78. Suppose v*a + n = p, -p + 15 = 5*a + 2. What is the tens digit of p?

Answer: 1


Question: Suppose 32975 = -0*r + 5*r. Suppose 5*k - i = 3*i - 6596, 5*i - r = 5*k. Let o = k + 7877/6. Find the common denominator of o and -39/10.

Answer: 30


Question: Three letters picked without replacement from zzamiiwmwimmwamam. What is prob of picking 3 w?

Answer:
1/680