Each book costed about $18.77
To do this problem do this:
9b = 187 - 18
This is because since you have 18 dollars left over subtract it from the total amount of money you had before.
9b = 169
Divide:
b = $18.77
To check you work multiply in 18.77, 9 times and add 18 dollars to it:
18.77(9) = 169
169 + 18 = 187
Tim had $187 dollars to spend.
Tim buys 9 books.
Tim has $18 dollars left after buying 9 books.
First, subtract the total amount of dollars Tim has to spend with his remaining balance after purchasing the books to find the total amount of cash spent on books.
$187 (total spending) - $18 (remaining balance) = $169 (spent on books)
Then, divide the amount of cash spent on books with the amount of books bought.
$169 (spent on books) ÷ 9 (books) = $18.77 (cost per book)
Quick note: You don't round up since this is dealing with cash. You can only round down, but leave to 2 decimal places (to the hundredths place) for a precise amount.
Tim spent $18.77 on each book.
