To model the situation with a pair of linear equations, we can set up the following equations based on the information provided:
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The total number of members participating in picking up litter (p) and cleaning hallways (c) is 25: \[ p + c = 25 \]
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The total amount of money raised from both activities should equal $300. The principal pays $15 for each member who picks up litter and $10 for each member who cleans the hallways: \[ 15p + 10c = 300 \]
So the correct pair of linear equations is: \[ p + c = 25 \] \[ 15p + 10c = 300 \]
This corresponds to the first set of equations in the options given: p + c = 25 ; 15p + 10c = 300.