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]: Let y be (46/8)/((-1)/(-20)). Suppose -2*r = 3*r - y. What is the remainder when r is divided by 6?
[A]: 5


[Q]: How many months are there in 1/4 of a century?
[A]: 300


[Q]: Let t be (-18)/(-8) + (-4)/16. Suppose t*c - 31 = 19. What is the units digit of c?
[A]:
5