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: Suppose -2*u + 2*o + 60 = 0, 4*u + 0*o = -5*o + 102. Calculate the highest common divisor of u and 42.

Output: 14


Input: Consider Input: How many meters are there in fourty-three halves of a kilometer?

Output: 21500


Input: Consider Input: What is prob of picking 1 k and 1 e when two letters picked without replacement from {i: 1, w: 1, k: 1, z: 1, e: 1}?


Output: 1/10