Analyze the diagram below and complete the instructions that follow.

The figure gives rise to two equations.
  6y = 90
  5y +3x = 180

There are several ways to go about this. Here's one.
  2y = 30 . . . . . . divide the first equation by 3
  (5y +3x) -(2y) = (180) -(30) . . . . subtract the equation above from the 2nd
  x + y = 150/3 = 50 . . . . . . . . . . divide by 3

The appropriate choice is the 3rd one, ...
  50

31/6= 19/6 19/6 *1/7=19/42