A card is chosen at random from a deck of 28 cards, 4 red, 14 black, 3 blue, and 7 green. Then, the card is returned to the deck and a new card is chosen. The table below shows the results of choosing 20 cards. For which color of card is the experimental probability the same as the theoretical probability?

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

or

answer: the answer is 110