Shane bought lunch for $5.38 and a shirt for $15.95. He then used the rest of his money to buy a book. He spent a total of $38.12. How much money did Shane spend on the book? (5 points)

Sense the total would only be $38.12, we would then only want to find out how much would the book be, and that would be it. We would then want to add both how much the shirt and also the lunch was in total, and by doing this, we would the have to subtract this amount from the total that Shane has spent in total.

[tex]\boxed{5.38+15.95 = 21.33 \ \sf(the \ amount \ of \ both \ lunch \ and \ shirt)}[/tex]

As we noted above, we then subtract both this total, and the amount that Shane has spent in this day.

[tex]\boxed{38.12-21.33 = \bf{16.79} \Leftarrow \ (the \ cost \ of \ book)}[/tex]

Your answer: The book that Shane has purchased was a total of only 16.79.

16.79 would be your answer.