a bag contains 18 coins consisting of quarters and dimes the total value of the coins is $2.85 which system of equation can be used to determine the number of quarters q, and the number of dimes d, in the bag

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.