Answer:
6 books for $21
Explanation:
In order to find the better deal you need to know what the cost is for 1 book corresponding to each deal, you do this by dividing the cost of the books by the total amount of books.
21/6 = $3.5
15/4 = $3.75
You can get books for a better deal by buying 6 books for $21
So first we are going to divide,
then we compare and see which is the lower price
15 divided by 4 = 3.75
21 divided by 6 = 3.5
4 books for 15 dollars is better I hoped i did the division right .
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