During a game night, friends Lisa, Mike, and Karen play a card game using a deck of cards containing 20 red, 15 blue, and 10 green cards. Lisa deals the cards evenly among the players, keeping track of how many cards of each color she has. During the game, Mike accidentally drops a red card under the table without noticing. Karen secretly swaps one of her blue cards with one of Lisa's green cards when she isn't looking. At the end of the game, how many cards does Lisa think she should have in total and what colors are they?
There are a total of 45 cards (20 red + 15 blue + 10 green) which are dealt evenly among the three players. This means each player gets 15 cards.

Initially, Lisa keeps track of her cards, but the game proceeds with two incidents affecting her count. First, Mike drops a red card, but since he does not notice, this doesn't directly affect Lisa's count. However, if Lisa were to notice that a card is missing from the total deck later, she might assume that she has one less card without knowing which color it is.

Later, Karen swaps one of her blue cards for one of Lisa's green cards. So, if Lisa originally had an equal distribution of colors, she would have started with 5 red, 5 blue, and 5 green cards. After the swap, she still has the same number of total cards, but now she has 5 red, 4 blue, and 6 green cards.

Therefore, without knowledge of the swap, Lisa would think she still has 5 red, 5 blue, and 5 green cards, totaling 15 cards. However, with the secret swap taken into account, Lisa actually has 5 red, 4 blue, and 6 green cards while believing she should have her original 5 of each color.