Nicolas buys 3 books. He gives the cashier $30 and gets $3 back. If each book costs the same amount, how much money dip each book cost? Explain

each book costs $9

Step-by-step explanation:

Nicolas gave the cashier $30 and she gave him $3 back, apparently 3books equals $30-$3=$27

so since we do not know the price of each we say 1 book equals x for 3books is 3X.

since since 3books=27 we say 3X=27.

divide through by 3 to give us 9.

each book equals $9