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 g = 6 - 6. Let b = 3 + g. Suppose -w - b = -21. What is the tens digit of w?
answer:
1


question:
What is 1/5 of a gram in milligrams?
answer:
200


question:
Suppose -2*g + 3*w = 0, 4*w + 0*w = -4*g + 20. Let a(p) = 2*p + 1. Let m be a(g). Let b be (-764)/(-36) - 4/18. What is the highest common divisor of b and m?
answer:

7