One week, Moussa earned $273.00 at his job when he worked for 13 hours. If he is paid the same hourly wage, how many hours would he have to work the next week to earn $378.00?
Moussa earned $273.00 in 13 hours, so his hourly wage is $273.00 / 13 hours = $<<273/13=21>>21.00/hour.
To earn $378.00 at the same hourly wage, Moussa would have to work $378.00 / $21.00/hour = <<378/21=18>>18 hours. Answer: \boxed{18}.