Question 418647
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Hi
worked a total of 23 hours 
Let x and (23-x) represent hours worked for night shift and day shift respectively
Question states***
  $16.50x + $13.50(23-x) = $352.50
Solving for x
     3x = 352.50 - 310.50
     3x = 42
      x = 14hrs worked on night shift.  Day shift 9hrs.  (23-14)
CHECKING our Answer***
  $16.50*14 + $13.50*9 = $352.50