Angela is playing a video game. In this game, players can score points only by collecting coins and stars. Each coin is worth $c$ points, and each star is worth $s$ points.
-- The first time she played, Angela scored 700 points. She collected 20 coins and 10 stars.
-- The second time she played, Angela scored 850 points. She collected 25 coins and 12 stars.
Which system of equations can be used to correctly determine the values of $c$ and $s$?
Difficulty: Easy
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