I did it taking help of Mr. Guess.
Please let me know the right approach.
regards,
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GMATPREP: Algebra
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Answer is B.
Total amount spent = 130.
Information provided in question is that all pencils cost either 21 or 23 cents so only combination for pencils that produces 130 equals
(4*21) + (2*23) = 130
Hence 4 pencils for 23 cents each.
I'm sure there are algebraic ways of finding this answer, but since I'm not gud at algebra I preferred this way.
Take combination of last digits of price (21 & 23) to make 10 as end result. We however know that there are 6 pencils bought. 130/20 would give 6.x .
Total amount spent = 130.
Information provided in question is that all pencils cost either 21 or 23 cents so only combination for pencils that produces 130 equals
(4*21) + (2*23) = 130
Hence 4 pencils for 23 cents each.
I'm sure there are algebraic ways of finding this answer, but since I'm not gud at algebra I preferred this way.
Take combination of last digits of price (21 & 23) to make 10 as end result. We however know that there are 6 pencils bought. 130/20 would give 6.x .
