Barbara worked as a registered nurse in the city last summer. The first week she was there she worked a total of 23 hours at a city hospital. She was paid $19 an hour for day shift and $24 an hour for night shift work. She earned $487 for her first week of work. How many hours did she spend on the day shift? How many hours did she spend on the night shift? Barbara worked how many hours in the day shift and
how many hours in the night shift?