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:
Let c be (5 + -4)/((-1)/3). What is the tens digit of c - (-6)/3 - -13?

Ex Output:
1


Ex Input:
What is prob of sequence ew when two letters picked without replacement from {w: 1, e: 2}?

Ex Output:
1/3


Ex Input:
What is 424806.5 millilitres in litres?

Ex Output:

424.8065