Ten years from now, orlando will be three times older than he is today. what is his current age?

So we need to find the age that these two equations are equal to. (X is his current age) x*3=?    and    x+10=?    These two equations MUST be equal. But because it is 3 times older, the equation will look like this: x + 10 = 4x  (you have to add in the current age he is)

So if we just start solving:
x + 10 = 4x
10 = 3x
x = 10/3 or approximately 3.33

If you have any questions feel free to ask!

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.