Lu can type 140 words in 5 minutes, and Ray can type 140 words in 4 minutes. how many can she type in 10 mins

280

Step-by-step explanation:

Lu can make 140 words in 5 mins which if means if she has 10 mins

and 5 x 2 is 10

then 140 x 2 = 280

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:

it will take 9 minutes