Gary is selling paperback and hardcover books at a yard

sale. He charges $2 for each paperback. He earned $10

in sales of hardcover books. He earned $20 selling books

at the yard sale. How many paperbacks did he sell?

Gary sold 5 paperback books

Step-by-step explanation:

each book is equal to $2 and $10 were made in Hardcover

So that only leaves us with ten unaccounted dollars

5x=10

Each book or (x) in this case is two dollars

so it will come out to be five books