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At a garage sale

by sanju09 » Thu Sep 16, 2010 10:25 pm
At a garage sale, Jeff sold 80% of his books, which include both hardbacks and paperbacks. He sold an equal number of each of the two types of books, selling all paperbacks for $1 each and all hardbacks for $3 each. How many books did Jeff own before the sale?

[1] Jeff's total revenue from the sale of his books was $32.

[2] Exactly two hardbacks and two paperbacks remained unsold after the sale.



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Source: — Data Sufficiency |
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by selango » Fri Sep 17, 2010 12:35 am
Number of Hardbacks=x

Number of Paperbacks=y

stmt1,

3x+y=32

x=y

4x=32 or x=8

x=8;y=8

80/100*(Total)=16

Total=20

Suff

stmt2,

80% sold and 20% remaining.

20/100*(Total)=4

Total=20

Suff

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