Brain Teasers
Vacation Books
Morgan came home from her vacation at Grandma's with 6 books. While she was away she purchased 3 books at the book store and got 1 book as a gift. During her stay at Grandma's, she also gave her cousin the 2 books that she finished.
How many books did she take with her when she left for her trip?
How many books did she take with her when she left for her trip?
Hint
Work backwards.Answer
Morgan started with 4 books.This is one way to work backwards:
Morgan returned with 6 books.
She gave away 2 of the books that she had.
So add those two books back to her total.
6 + 2 = 8
She had received 1 book that she had not brought with her.
So subtract that book from her total.
8 - 1 = 7
She bought 3 books that she had not brought with her.
So subtract those books from her total.
7 - 3 = 4
She must have left for vacation with 4 books.
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