instruction:
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).
question:
Calculate prob of sequence nesl when four letters picked without replacement from {a: 1, v: 2, e: 2, n: 1, l: 1, s: 1}.
answer:
1/840


question:
Let p(c) = 3*c - 13. Suppose -23 = -3*s + b, -2*s + 4*s - 2*b = 14. Calculate the smallest common multiple of p(s) and 5.
answer:
55


question:
Let f = 184 - 40. Suppose -5*x - 4*c = -f, 0 = 2*c + 2*c + 16. Suppose b = -3*b + x. What is the units digit of b?
answer:

8