Two friends, alejandra and mia, agreed to split the check at a restaurant. alejandra ordered $12 worth of food and mia ordered $18 worth. at the end of the meal, alejandra put her $12 contribution on the table, plus a 20% tip and mia put her $18 contribution on the table, plus a 15% tip. the total tip left by alejandra and mia is equal to r\% of the total check for their table, where the "total check" amount does not include the tip. what is r?

the graph top, left is y = 4x

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: