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]: Two letters picked without replacement from emltz. What is prob of sequence el?
[A]: 1/20


[Q]: Two letters picked without replacement from qsbvbbbqqvbs. Give prob of picking 2 q.
[A]: 1/22


[Q]: Suppose -a + 5*a - 8 = 0. Let x be -5*a/(-5)*1. Solve 5 + 1 = 2*s - 4*z, 4*s - x*z - 18 = 0 for s.
[A]:
5