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