Bob wants to buy cards with $20. Each card cost between $1.80 and $2.25. What is the maximum number of cards he can buy?

Answer 1

Assuming there are no sales taxes, the maximum number of cards is
floor(20/1.8)=11
That is if he does not buy the more expensive cards.

Note:floor(x) is the biggest integer not exceeding x. In the above example, 20/1.8=11.111..., and the biggest integer that does not exceed 11.111 is 11.

Answer 2

if he buys the most expensive then he can only buy 8