Question

The reading group checked out 36 library books. 17 books are fiction, 10 are biographies, and some are science. How many books are science?​

Answer 1

9 science books

Explanation:

Step 1) 36 - 17 = 19

Step 2) 19 - 10 = 9

Answer 2

17+10=27
36-27= 9
so 9 books are science