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).

What is (-265)/477*12/(-40)?
1/6

Calculate prob of sequence pb when two letters picked without replacement from aapbbpppbpppbabab.
21/136

Suppose 6*o = 4*o. Suppose -4*k + 5*k - 2 = o. Suppose 0 = k*d + 3*d + 3*a - 73, -d = -3*a - 11. What is the least common multiple of d and 20?

140