 Quandaries and Queries Hi I was hoping that you could help me with this problem.  I believe that this is a high school level problem but as an adult who has forgotten the "rules", I am stuck.   the equation is this:   x=t2/(t1-t2)   we know that x=5.73                      t1=303   we must solve for t2   Thank you Anthony Hi Anthony, An equation is like a balance. You can can change one side by adding, subtracting, multiplying or dividing a quantity as long as you perform the identical operation on the other side also. The goal is to obtain an equivalent equation of the form t2 = some quantity. In your equation x = t2/(t1-t2) I would first multiply both sides by t1-t2 to get x (t1 - t2) = t2/(t1-t2) (t1-t2) so x (t1 - t2) = t2 Expanding the left side gives x t1 - x t2 = t2 You want one side of the equation to have only t2 so add x t2 to both sides to get x t1 - x t2 + x t2 = t2 + x t2 which simplifies to x t1 = (1 + x) t2 Now divide both sides by (1 + x) to obtain  (x t1)/(1+x) = t2 You have x = 5.73 and t1 = 303 so t2 = 5.73 303/5.73 + 1 = 1736.19/6.73 = 257.98 Penny Go to Math Central