From the condition, you have these two equations G + L = 97 (1) L = 3G + 5 (2) Substitute expression (2) into equation (1) to get G + (3G + 5) = 97. Simplify and solve for G 4G + 5 = 97 4G = 97 - 5 4G = 92 G = 92/4 = 23. ANSWER. Gary is 23 years old. Larry is 3*23+5 = 74 years old. CHECK. 23 + 74 = 97. ! Correct !