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Average of 2 books, then a total of 6 books purchased. H and J already purchased 5 books cumulative. I is left with no other option than buying 1 book to keep the average 2.

Hence A
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Bunuel
Helen, Jim, and Ivan each purchased some books at a bookstore. Helen purchased 4 books and Jim purchased 1 book. If the 3 people purchased an average (arithmetic mean) of 2 books per person, how many books did Ivan purchase?

A. 1
B. 2
C. 3
D. 4
E. 5

Since the total number of books purchased is 3 x 2 = 6, Ivan purchased 6 - 4 - 1 = 1 book.

Answer: A
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Bunuel
Helen, Jim, and Ivan each purchased some books at a bookstore. Helen purchased 4 books and Jim purchased 1 book. If the 3 people purchased an average (arithmetic mean) of 2 books per person, how many books did Ivan purchase?

A. 1
B. 2
C. 3
D. 4
E. 5

Total Books Purchased = Average * Number of People = 2 * 3 = 6
Books purchased by Helen + Jim = 4 + 1 = 5

Therefore, # of books purchased by Ivan = 6 - 5 = 1

ANSWER: A
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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