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]: What is 51/2 of a millisecond in microseconds?
[A]: 25500


[Q]: Solve 3*x = t + 11, 2*x = 3*x + 4*t - 21 for x.
[A]: 5


[Q]: How many milliseconds are there in 4.649586us?
[A]:
0.004649586