Solving a value mixture problem using a linear question

label Algebra
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A store offer 2 versions of a song.  The standard size is 2.1 MB while the high-quality version is 4.7 MB. Yesterday there were a 1000 downloads of the song for a total size of 3894 MB.  How many downloads were the high-quality version. 

Nov 14th, 2015

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Answer is

690   downloads of high - quality

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Nov 14th, 2015

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