It takes 15 workers to do a certain job, who work 12 days out of 5 hours a day. In how many days will 10 workers, working 9 hours a day, finish this job?

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18