You can set up an equation so lets assume ellens age is e. three times ellens age would be 3e so when 60 is subtracted you do 3e-60, as this results in her age you can say that 3e-60=e You can take away the e from both sides and get 2e-60=0. If you add the 60 to both sides, you get 2e=60. When you divide 60 by 2 you get 30. Therefore, ellens age is 30