Akarate studio charges $35 for the first course and $22.50 for each course after that, even if the student leaves the course early. cena paid $170 for her son to take courses. how many courses did he take? 6 courses 7 courses 8 courses 10 courses

Answer-

He took 7 courses.

Solution-

A karate studio charges $35 for the first course and $22.50 for each course after that.

Cena paid $170 for her son to take courses.

Let us assume that he took x number of courses.

So, for the first class he will pay $35, then for the remaining (x-1) days he will pay $22.50 per day.

So the total amount paid by him is,

But it is given that he totally paid $170, so

Therefore, he took 7 courses.

both equations and proportions are better.