Micaela And three of her friends volunteered to collect children’s books for the cities homeless shelters there are four homeless shelters in the area and each shelter received 18 bucks how many books did Micaela and her three friends collect all together?

Since there are 4 homeless shelters and each shelter received 18 books, Micaela and her friends collected a total of 4 x 18 = 72 books.