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: What comes next: 59, 84, 121, 170, 231?

A: 304
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Q: What is prob of picking 1 u and 3 f when four letters picked without replacement from wfffsmfwu?

A: 2/63
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Q: Suppose 5*r - c = 16, 3*r - 2*c = 3 + 8. Solve 3*i - 8 - 1 = 0, -4*f - r*i = 3 for f.

A:
-3
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