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).

Suppose 2*n + 2*n = 4. Suppose -n = f - 2. What is the highest common divisor of f and 5?
1

Suppose -2*t - 51 = -5*t + 3*l, 37 = 3*t + 4*l. Calculate the common denominator of 1*(308/32 + 3) and t.
8

Calculate prob of picking 2 q when two letters picked without replacement from qbbbbqbbqqpbpqbbq.

15/136