Question 848650
Let x be your age now and F be your future age in 15 years.



(Age in 15 years) = (Age now) + 15


( F )  = ( x ) + 15


F = x + 15


F = 16 + 15 ... it says "If you are 16 years old now", so x = 16


F = 31


You'll be <font size=4 color="red">31 years old</font> 15 years from now.


The equation used is either <font size=4 color="red">F = x + 15</font> or <font size=4 color="red">F = 16 + 15</font> depending on how you do it. You can also manipulate the equation to get either F - x = 15 or F - 16 = 15. So there are many ways to do this.