Question

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 / x = 3 << the slash is divided

3 x = 15

15 - x = 3

Answer 1

s = m - 3
m = 15

x = 15 - 3
x = 12

the answer is the 2nd one