Question

The sum of 3 number is 80. the third number is 3 times the first. the first number is 5 less the second. what are the numbers

Answer 1

1st number = x-5
2nd number = x
3rd number = 3x-15
Total = 80
x-5+x+3x-15=80
5x-20=80
5x=100
x=20
The numbers are 20, 15, 45