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# A certain store sells all maps at one price and all books at

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Director
Joined: 06 Feb 2006
Posts: 897
A certain store sells all maps at one price and all books at [#permalink]

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04 Jun 2006, 03:38
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A certain store sells all maps at one price and all books at another price. On Monday the store sold 12 maps and 10 books for a total of $38, and on Tuesday the store sold 20 maps and 15 books for a total of$60. At this store, how much less does a map sell for than a book?

A) $0.25 B)$0.5
C) $0.75 D)$1.00
E) \$1.25
Director
Joined: 10 Oct 2005
Posts: 718

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04 Jun 2006, 05:10
solving simultaneous equations
12M+10B=38
20M+15B=60---->simplifying=>4M+3B=12 from this we can get
M=(12-3B)/4
substituting M in first equation
12*{(12-3B)/4}+10B=38
36-9B+10B=38
B=2
M=1.5
2-1.5=0.5
B it is
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04 Jun 2006, 05:10
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