T = 4 + 2A S = 5A - 8 T = S Since T and S are equal, set them against each other 2A + 4 = 5A - 8 Subtract 2A from each side, and add 8 to each side 12 = 3A Divide each side by 3 A = 4 So Andrew is 4 years old If Andrew is 4, then Tom is twice that plus 4, or 12. Sarah is 5 times 4 less 8, or 12.
