 # A Web music store offers two versions of a popular song. The size of the standard version is 2.3 MB. protestommb 2022-06-25 Answered
A Web music store offers two versions of a popular song. The size of the standard version is 2.3 MB. The size of the high-quality version is 4.8 MB. Yesterday, there were 1020 downloads of the song, for a total download size of 3946 MB. How many downloads of the high-quality version were there?
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Let the number of standard version be x
Let the number of high quality version be y

According to question:
$x+y=1020\left(1\right)$
$2.3x+4.8y=3946\left(2\right)$

Multiply equation (1) by 2.3 and then subtract from equation (2)
$2.3x+4.8y-2.3x-2.3y=3946-2346$
$2.5y=1600$
$y=\frac{1600}{2.5}$
$y=640$
Hence, the number of high quality version is 640.

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