A textbook store sold a combined total of 272 biology and math textbooks in a week. The number of biology textbooks sold was three times the number of math textbooks sold. How many textbooks of each type were sold?
Number of biology textbooks sold: ?

Number of math textbooks sold: ?

biobooks = 204

mathbooks = 68

Step-by-step explanation:

the bio textbooks make up 3 parts

the math textbooks make up 1 part

the denominator therefore is 4

so biobooks = 272 * 3/4

and mathbooks = 272 * 1/4 (272 : 2 : 2)

note that calculating the mathbooks 1st is easier, bc you can then multiply by 3 to get the biobooks.

add both numbers up to proof that the sum is 272

(would really appreciate the brainliest)

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: