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Caissa can download a maximum of 1000 megabytes (MB) of songs or movies to her smartphone each month. The file size of each movie is 
85MB, and the file size of each song is 
4MB.
Write an inequality that represents the number of movies 
(M) and songs 
(S) that Caissa can download each month.

Caissa can download a maximum of 1000MB1000\,\text{MB} of songs or movies to her smartphone each month. The file size of each movie is 85MB85\,\text{MB}, and the file size of each song is 4MB4\,\text{MB}. Write an inequality that represents the number of movies (M)(M) and songs (S)(S) that Caissa can download each month.

Full solution

Q. Caissa can download a maximum of 1000MB1000\,\text{MB} of songs or movies to her smartphone each month. The file size of each movie is 85MB85\,\text{MB}, and the file size of each song is 4MB4\,\text{MB}. Write an inequality that represents the number of movies (M)(M) and songs (S)(S) that Caissa can download each month.
  1. Identify variables and file sizes: Identify the variables and their corresponding file sizes.\newlineMovies are represented by MM and each movie is 85MB85\,\text{MB}. Songs are represented by SS and each song is 4MB4\,\text{MB}. Caissa can download a maximum of 1000MB1000\,\text{MB} each month.
  2. Write inequality for total file size: Write an inequality that represents the total file size of movies and songs downloaded.\newlineThe total file size for movies downloaded is 85M85M and for songs is 4S4S. The sum of these must be less than or equal to 1000MB1000\,\text{MB}.\newlineSo, the inequality is 85M+4S100085M + 4S \leq 1000.
  3. Check if inequality makes sense: Check the inequality to ensure it makes sense in the context of the problem.\newlineIf MM is 00 (no movies downloaded), then SS can be at most 250250 (since 4×250=10004 \times 250 = 1000). If SS is 00 (no songs downloaded), then MM can be at most 1111 (since 85×11=93585 \times 11 = 935, and 0000, which is greater than 0011). The inequality seems to correctly represent the situation.

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