how many books do you need to buy to make the cost the sam at club a and club c.

Question

 club a has the first book free and the rest 8 dollars and club c the first two books cost 10 dollars and the rest 6 dollars

Answer 1

Let n be the number of books.

Cost at club a: 8(n-1)

Cost at club b: 20+6(n-2)

The same cost means 8(n-1) = 20+6(n-2)

Distribut: 8n - 8 = 20 + 6n - 12

Collect variables in one side, and constants in the other side,

2n = 16

n = 8 books <==Answer