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]: Solve -27*c + 116 = -46 for c.
[A]: 6


[Q]: Calculate prob of picking 1 c and 3 d when four letters picked without replacement from {i: 2, h: 4, k: 3, c: 6, d: 3}.
[A]: 1/510


[Q]: Suppose -5*p = -0*p + 5*s + 25, -5*p = -2*s - 10. Suppose p = -r + 15 - 2. Let l be (-6500)/150*3/(-2). Calculate the greatest common factor of r and l.
[A]:
13