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.
Let's say the third number is x.
The sum of the second and third number is 500-200 = <<500-200=300>>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=100>>100
#### 100