Two sisters bought together 10 cookies One bought 4 cookies. How many cookies did the other
buy?
sisters

What properties allow transformation to be used as a problem solving tool

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.

Someone me! if you’re smart you can solve this!