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: How many micrometers are there in 7/8 of a millimeter?

A: 875
****
Q: Four letters picked without replacement from rsisririrsshs. What is prob of sequence iirr?

A: 3/715
****
Q: Solve 5*i = 9*i - 3*q - 20, -4*i + 20 = -2*q for i.

A:
5
****