She can carry 5 books, because 2 + 1 = 3 and 18 - 3 =15, so then multiply 3 times 5 because 3 times 5 is 15. I hope this helped!
Answer: 4. A
5. C
6. B
Step-by-step explanation:
and the second one 2 will work!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!