To find the total number of pages printed for both the 6th-grade and 7th-grade packets, we can set up the following expression:
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Each 6th-grade packet is 10 pages long. If \( p \) represents the number of 6th-grade packets, then the total number of pages from the 6th-grade packets is \( 10p \).
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Each 7th-grade packet is 12 pages long. If \( r \) represents the number of 7th-grade packets, then the total number of pages from the 7th-grade packets is \( 12r \).
To get the total number of pages printed, we add the pages from both grades:
\[ \text{Total Pages} = 10p + 12r \]
Therefore, the expression that represents the total number of pages printed is \( 10p + 12r \).
If you provided options A, B, C, and D, please specify what they are so I can identify which corresponds to this expression.