Arturo O. answered 01/12/20
Experienced Physics Teacher for Physics Tutoring
I assume you meant to say 2 numbers that add up to 108, and one number is 3 times the other (not 3 times each other). The numbers are x and 3x.
x + 3x = 108
4x = 108
x = 108/4 = 27
3x = 3(27) = 81
Test the answer.