The sum of the three numbers is 500. If the first number is 200, and the value of the second number is twice the value of the third number, find the value of the third number.
Thoughts? Step-by-step reasoning:
Let's say the third number is x. The sum of the second and third number is 500 - 200 = 300. Since the third number is x, the sum of the values of the second and third number is x + 2x = 300. This is 3x = 300. The value of the third number is x = 300 / 3. x = 100.
Thus, the answer is 100.