TASK DEFINITION: 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).
PROBLEM: Two letters picked without replacement from {z: 7, a: 6, r: 1, y: 4, j: 2}. What is prob of sequence az?

SOLUTION: 21/190

PROBLEM: Let p be (0 - 2 - -3) + 0. Let u = -157/4 - -41. What is the common denominator of u and p + 143/(-6) + 2?

SOLUTION: 12

PROBLEM: Let o(z) = -4*z - 12. What is the tens digit of o(-8)?

SOLUTION:
2