2008 October 9th, 02:43 AM
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#1 (permalink) |
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Within my grasp!
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Join Date: Mar 2005
Posts: 142
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Very interesting equations DS
Jim bought some pencils for $0.35 each and some notebooks for $0.45 each. How many notebooks did he buy ?
(1) He bought same number of Notebooks and Pencils (2) He spent a total of $3.2 on the notebooks and Pencils SPOILER: B |
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2008 October 9th, 02:57 AM
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#2 (permalink) |
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Gone in 120 sec
Join Date: Mar 2008
Posts: 608
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For our convenience let us multiply all the numbers by 100.
Given eqn: 35P+45N ;N=? (I) P=N ; 35P+45P nothing helps as we dont have RHS of the eqn. (II) 35P+45N=320 => 7P+9N=64 Only when P=4 and N=4 the eqn holds good. We can have different decimals but number of pencils and number of notebook cant be in decimals. SUFF |
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2008 October 9th, 03:01 AM
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#3 (permalink) |
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Within my grasp!
Join Date: Mar 2005
Posts: 142
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Hmm....great...I was trying to do it using decimals ...and was just wondering how to know that there is only possible solution for (2). I like your approach Shooter - to make the equation simple....and in that way its quite evident that 4 is the answer
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