The Rodriguez family and the Alexander family each used their sprinklers last summer. The water output rate for the Rodriguez family's sprinkler was 40 L per hour. The water output rate for the Alexander family's sprinkler was 35 L per hour. The families used their sprinklers for a combined total of 45 hours, resulting in a total water output of 1700 L. How long was each sprinkler used?

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:

mxb67

step-by-step explanation:

your answer   is c

step-by-step explanation:

-1   1/6.   you dont subtract the denominators

step-by-step explanation: