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A store sells erasers for 0.23$ per piece and pencil for 0.1

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A store sells erasers for 0.23$ per piece and pencil for 0.1 [#permalink] New post 26 Jul 2014, 09:36
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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

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Re: A store sells erasers for 0.23$ per piece and pencil for 0.1 [#permalink] New post 26 Jul 2014, 09:47
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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.
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Re: A store sells erasers for 0.23$ per piece and pencil for 0.1 [#permalink] New post 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.


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Hope it helps.
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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

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COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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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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A store sells erasers for 0.23$ per piece and pencil for 0.1

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