Question

The sum of three equal 106.

The third number is 6 less than first.
The second three time the third.
What are the number.

Answer 1

x+y+z=106
x=z-6
y=3z

Now put those in the equation.

z-6+z+3z=106
z+z+3z=100
5z=100
z=20

The numbers are:
1st: 26
2nd: 60
3rd: 20