Last month Alex spend $91 on video games rentals, spending $5 for each one-day, $8 for each 3 days rental, and $10 for each 7days. Alex never rented the same game twice, and he rented fewer than 6 games in one-day rentals. How many different games did Alex rent last month?
(1) Last month Alex spend $20 in seven day video game rentals
(2) Last month Alex spend $56 in three days video game rentals