TASK DEFINITION: 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).
PROBLEM: What is next in 240, 198, 156, 114, 72, 30?

SOLUTION: -12

PROBLEM: What comes next: -13616, -13610, -13602, -13592, -13580, -13566, -13550?

SOLUTION: -13532

PROBLEM: Four letters picked without replacement from vwvwvvwvwvvvvvvvvv. Give prob of sequence vwww.

SOLUTION:
7/1530