One month, ruby worked 6 hours more than isaac, and svetlana worked 4 times as many hours as ruby. together they worked 126 hours find the number of hours each person worked.

Let x hours be the number of hours Issac worked
     x+6 hours be the number of hours Ruby worked
    4(x+6) hours be the number of hours Svetlana worked.

x + x + 6 + 4(x+6) = 126
x + x + 6 + 4x +24 = 126
                   6x +30 = 126
                          6x = 96
                            x = 16
Therefore, Issac worked 16 hours.
                  Ruby worked 16+6 = 22 hours
                  Svetlana worked 22 × 4 = 88 hours.