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hammer [34]
3 years ago
13

A web store offers two versions of a popular song. the size of the standard version is 2.5 megabytes. the size of the high-quali

ty version is 4.6 megabytes. yesterday there were 1230 downloads of the song, for a total download size of 4797 megabytes. how many downloads of the standard version were there?
Mathematics
1 answer:
Komok [63]3 years ago
3 0
---------------------------------------------------
Define x and y :
---------------------------------------------------
Let x the number of 2.5M downloads.
Let y the number of 4.6M downloads.

---------------------------------------------------
Construct Equations :
--------------------------------------------------
There was a total of 1230 downloads.
⇒ x + y = 1230

Total downloaded size was 4797M.
⇒2.5x + 4.6y = 4797

---------------------------------------------------
Find x and y :
---------------------------------------------------
x + y = 1230 -------------------- (1)
2.5x + 4.6y = 4797 ------------ (2)

---------------------------------------------------
From equation 1 :
---------------------------------------------------
x + y = 1230
x = 1230 - y                               // Take away y on both sides

---------------------------------------------------
Sub x = 1230 - y into equation 2 :
---------------------------------------------------
2.5 (1230 - y) + 4.6y = 4797      // Sub x = 1230 
3075 - 2.5y + 4.6y = 4797         // Apply distributive property
3075 + 2.1y = 4797                   // Combine like terms
2.1y = 1722                               // Take away 3075 from both sides
y = 820                                      // Divide by 2.1 on both sides

---------------------------------------------------
Sub y = 820 into equation 1 to find x :
---------------------------------------------------
x + y = 1230   
x + 820 = 1230                        // Sub y = 820
x = 410                                     // Take away 820 from both sides

---------------------------------------------------
Find the number of each type of downloads :
---------------------------------------------------
Number of 2.5M downloads = x = 410
Number of 4.6M downloads = y = 820 

-------------------------------------------------------------------------------------
Answer: There were 410 downloads for the standard version.
-------------------------------------------------------------------------------------

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