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).

[EX Q]: Let z = 27 - 9. Suppose 2*t = -3*t - 4*l + 38, 4*l = 5*t - 22. What is the highest common divisor of z and t?
[EX A]: 6

[EX Q]: Let a(y) = y**3 - 3*y**2 + 7*y - 10. Let m be a(2). Let k(p) = -p**3 + 2*p**2 + p + 1. Let r be k(2). Solve m = r*d + 16 - 1 for d.
[EX A]: -5

[EX Q]: Calculate prob of picking 2 j and 1 c when three letters picked without replacement from {c: 4, x: 4, j: 8, q: 4}.
[EX A]:
28/285