St=20 and s lies at 5 where could t be located ?

Arestaurant charges $100 to rent its banquet room for an event. it also charges $15 to serve dinner to each guest. write an equation for the total cost of the banquet room in terms of the number of guests. deine your variables. what is the total cost of the banquet room for 20 guests?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

Can someone explain to me how to do