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 is prob of picking 4 z when four letters picked without replacement from {y: 3, z: 4, b: 13}?
[A]: 1/4845


[Q]: Let q = 14 - 24. Let z = q + 21. Solve -z = 2*c - 1 for c.
[A]: -5


[Q]: Multiply 26.6 and 2.
[A]:
53.2