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: Suppose 60*x + 70 = 65*x. Calculate the highest common factor of x and 21.

Answer: 7


Question: What is prob of sequence yyy when three letters picked without replacement from eyeeeyyyeeeyyy?

Answer: 5/52


Question: Let c = -5 + 18. Let o be (2/(-3))/(2/(-15)). Suppose 93 = o*i - 97. What is the remainder when i is divided by c?

Answer:
12