A number that has a quotient of six and a remainder of 12

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.

Which phrase generalizes the specific terminology bolded in the text?

Joe had 25 pencils he divided them into 5 pieces how many pieces does he have left