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).

Input: Consider Input: What comes next: -27, -49, -73, -99?

Output: -127


Input: Consider Input: What is 51/2 of a millisecond in microseconds?

Output: 25500


Input: Consider Input: Calculate prob of sequence rkr when three letters picked without replacement from qkqfqrqqrtfq.


Output: 1/660