Answer:
Cost of each of the seven book of Alyssa is 38 dollars.
Solution:
Given that initial amount with Alyssa = 284 dollars
Number of books she purchased = 7
Amount remaining after buying the books = 18 dollar
Lets first find amount spent by her on 7 books
Amount spent on seven books = Initial amount – Amount left after buying books
= 284 – 18 = 266
So Amount spent on seven books = 266.
to solve further we need to consider that cost of each book is same.
lets assume cost of 1 book = "x" dollars
So cost of 7 books = 7x dollars
Amount spent on seven book = cost of 7 books
=> 266 = 7x
solving the above equation for x
=> x = 266/7 = 38 dollars
Hence cost of each of the seven book is x = 38 dollars.