All i need on is the part that says a hotel

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

98 point question what is the record for most points in one

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab