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# A store sells erasers for 0.23$per piece and pencil for 0.1  Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: Director Joined: 17 Apr 2013 Posts: 636 Concentration: Entrepreneurship, Leadership Schools: HBS '16 GMAT 1: 710 Q50 V36 GMAT 2: 750 Q51 V41 GMAT 3: 790 Q51 V49 GPA: 3.3 Followers: 22 Kudos [?]: 172 [1] , given: 284 A store sells erasers for 0.23$ per piece and pencil for 0.1 [#permalink]  26 Jul 2014, 09:36
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Question Stats:

77% (01:50) correct 23% (00:49) wrong based on 88 sessions
A store sells erasers for 0.23$per piece and pencil for 0.11$ per piece. How many eraser and pencils did Jessica buy?

(1) She bough 5 erasers
(2) She spent total of 1.70$[Reveal] Spoiler: OA _________________ Like my post Send me a Kudos It is a Good manner. My Debrief: how-to-score-750-and-750-i-moved-from-710-to-189016.html Math Expert Joined: 02 Sep 2009 Posts: 29750 Followers: 4894 Kudos [?]: 53374 [0], given: 8155 Re: A store sells erasers for 0.23$ per piece and pencil for 0.1 [#permalink]  26 Jul 2014, 09:47
Expert's post
A store sells erasers for 0.23$per piece and pencil for 0.11$ per piece. How many eraser and pencils did Jessica buy?

(1) She bough 5 erasers. Clearly insufficient.

(2) She spent total of 1.70$--> $$0.23e+0.11p=1.70$$ --> $$23e+11p=170$$ --> by trial and error we can find that the only non-negative integer solution for this equation is e=5 and p=5. Sufficient. Answer: B. _________________ Math Expert Joined: 02 Sep 2009 Posts: 29750 Followers: 4894 Kudos [?]: 53374 [0], given: 8155 Re: A store sells erasers for 0.23$ per piece and pencil for 0.1 [#permalink]  26 Jul 2014, 09:47
Expert's post
Bunuel wrote:
A store sells erasers for 0.23$per piece and pencil for 0.11$ per piece. How many eraser and pencils did Jessica buy?

(1) She bough 5 erasers. Clearly insufficient.

(2) She spent total of 1.70$--> $$0.23e+0.11p=1.70$$ --> $$23e+11p=170$$ --> by trial and error we can find that the only non-negative integer solution for this equation is e=5 and p=5. Sufficient. Answer: B. Similar questions to practice: eunice-sold-several-cakes-if-each-cake-sold-for-either-109602.html martha-bought-several-pencils-if-each-pencil-was-either-a-100204.html a-rental-car-agency-purchases-fleet-vehicles-in-two-sizes-a-105682.html joe-bought-only-twenty-cent-stamps-and-thirty-cent-stamps-106212.html a-certain-fruit-stand-sold-apples-for-0-70-each-and-bananas-101966.html joanna-bought-only-0-15-stamps-and-0-29-stamps-how-many-101743.html Hope it helps. _________________ Re: A store sells erasers for 0.23$ per piece and pencil for 0.1   [#permalink] 26 Jul 2014, 09:47
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