instruction:
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).
question:
Let p(c) = 3*c - 13. Suppose -23 = -3*s + b, -2*s + 4*s - 2*b = 14. Calculate the smallest common multiple of p(s) and 5.
answer:
55


question:
Suppose 2*k + 3*l + 2 - 1 = 0, 3*k - 2*l - 5 = 0. Let f be (4/k)/((-1)/(-2)). Suppose 3*r + 5 = f. What is the lowest common multiple of r and 3?
answer:
3


question:
What is prob of picking 4 i when four letters picked without replacement from iidididdidiid?
answer:

7/143