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:
Four letters picked without replacement from {e: 8, m: 2}. Give prob of sequence emme.
answer:
1/45


question:
What is 258875.4 centuries in decades?
answer:
2588754


question:
Suppose 5*f - 191 = 5*k + 89, 0 = -4*k - 20. What is the greatest common divisor of f and 255?
answer:

51