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).

Ex Input:
What is prob of sequence rrr when three letters picked without replacement from bbbrbbbbbwrrwrrrrr?

Ex Output:
7/102


Ex Input:
Evaluate (4/(-18))/((-15)/135).

Ex Output:
2


Ex Input:
What is prob of picking 1 l, 1 f, 1 p, and 1 i when four letters picked without replacement from {i: 3, y: 1, p: 3, f: 3, a: 7, l: 1}?

Ex Output:

3/340