Question

For breakfast, the cafeteria offers scrambled eggs with one slice of toast or an egg sandwich made with two slices of toast. In fifteen minutes, they sold 13 breakfasts and used 21 slices of bread. Use a model to determine how many egg sandwiches they sold.

A. 6

B. 7

C. 8

D. 9

Answer 1

C. 8

Answer 2

BZ-Baby --> If you're still here, I'll show the equations.

Answer 3

Yeah, I was just working on another equation.

Answer 4

Let x = the number of scrambled egg/ 1 toast sold
Let y = the number of egg sandwiches sold

Answer 5

Then,

x + y = 13

and

1*x + 2*y = 21 --> This is for the bread used, 1 for just eggs and 2 for each sandwich.

We have to solve simultaneiious equations: (substitution method)

x + y = 13 so x = 13 - y
1*x + 2*y = 21

so 13 - y + 2y = 21

y = 8 ---> 8 egg sandwiches