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:
Divide -1830 by -6.
answer:
305


question:
What is next in 240, 198, 156, 114, 72, 30?
answer:
-12


question:
Calculate prob of sequence xd when two letters picked without replacement from {d: 2, z: 5, x: 1, v: 11}.
answer:

1/171