Micaela and her three friends collected children's books for a total of 1 + 3 = <<1+3=4>>4 people.
They collected 18 books per homeless shelter, so they collected a total of 4 x 18 = <<4*18=72>>72 books. Answer: \boxed{72}.
micaela and three of her friends volunteered to collect childrens books for the city homeless shelters. there are 4 homeless shelters in the area and each shelter received 18 books how many books did micaela and her three friends collect altogether
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