My age today is three times what it will be three years from now, minus three times what my age was three years ago. How old am I?
Answer
18 years old.
Let my age be x years now.
My age after 3 years is (x+3).
My age 3 years ago is (x-3).
So, now we can come up with an equation for x: x=3(x+3)-3(x-3)
Solving for x will give 18.