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).
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Question: Calculate prob of picking 1 c and 3 d when four letters picked without replacement from {i: 2, h: 4, k: 3, c: 6, d: 3}.

Answer: 1/510


Question: Let y be (46/8)/((-1)/(-20)). Suppose -2*r = 3*r - y. What is the remainder when r is divided by 6?

Answer: 5


Question: Convert 4.754196m to kilometers.

Answer:
0.004754196