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).

Two letters picked without replacement from {f: 3, l: 2, s: 4, q: 1}. Give prob of sequence lq.
1/45

Let l = 1 + 7. Solve 4 + l = 3*s for s.
4

Let u(q) = -q + 6. Let w be u(7). Let z(v) = v + 7. Let p be z(-5). What is the units digit of w + 17 + (-1 - p)?

3