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).

What comes next: -13616, -13610, -13602, -13592, -13580, -13566, -13550?
-13532

What is prob of picking 1 f and 2 n when three letters picked without replacement from {d: 1, f: 1, a: 2, n: 13}?
39/340

Suppose 2*a - 2*r - 3*r = 9, 5*r - 3 = a. Suppose 0 = -3*p - p + a. Solve 5*d - t = 4*t, p*d = -3*t + 30 for d.

5