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).

[Q]: Let y be (1 - -1)/(-1) + -25. What is the common denominator of 117/10 and (y/(-30))/((-9)/(-111))?
[A]: 10


[Q]: In base 10, what is -151 - 26?
[A]: -177


[Q]: What is prob of sequence cs when two letters picked without replacement from {f: 4, c: 1, w: 1, g: 1, s: 2}?
[A]:
1/36