Question 348185
In Tim's Music Shop, the sales of records, tape cartridges, and cassettes form the ratio 3 : 4 : 6, respectively. In a window display of 65 items, how many of each kind should be included to match the customers' typical preferences?
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All I can say is that your textbook is very old -- back before CDs even.  Are those tape cartridges 8-tracks?</i></font>
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Put each of the ratio numbers 3, 4 and 6 over their sum 3+4+6 = 13 
making these three fractions

{{{3/13}}}, {{{4/13}}}, and {{{6/13}}}

Now multiply each fraction by 65

{{{expr(3/13)*65=15}}}, {{{expr(4/13)*65=20}}}, {{{expr(6/13)*65=30}}}

15 records, 20 tape cartridges, and 30 cassettes.    

Edwin</pre>