This is the Ava one...
steps to solve :
Ava has 25 books....she gives 7 away....this means u would subtract 7 from her total number of books...25 - 7 = 18
but then she is given 12 more...this means u would add 12 to the number of books she has after giving away 7 of them.....18 + 12 = 30.