Seudónimo Seudónimo 19-10-2017 Mathematics contestada Sam is 3 years younger than Marco. Marco is 15 years old. How old is Sam? Let X represent Sam's age (there are 2 correct answers) x + 15 = 3 x + 3 = 15 15 divided by x = 3 3 x = 15 15 - x = 3 thanks