What is the second number

Question

The sum of three numbers is 123

The second number is 4 times the first 

The third number is 12 less than the second number 

Answer 1

x = 1st number

4x = 2nd number

4x - 12 = 3rd number

 

x + 4x + 4x - 12 = 123

9x - 12 = 123

9x = 135

x = 15

4x = 60

4x - 12 = 48

 

The 2nd number is 60