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 b = 42 - 19. Calculate the remainder when 112 is divided by b.
[A]: 20


[Q]: Four letters picked without replacement from vjxsxjsjj. What is prob of sequence jxvx?
[A]: 1/378


[Q]: Suppose -2*n - n = -81. Let s be (-2)/(2/(-1)) + 3. Suppose 17 = s*j - n. What is the units digit of j?
[A]:
1