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

Answer: 21500


Question: What is prob of picking 3 t and 1 b when four letters picked without replacement from {t: 5, b: 3}?

Answer: 3/7


Question: What is prob of picking 1 f and 1 d when two letters picked without replacement from {t: 1, b: 2, f: 1, d: 2}?

Answer:
2/15