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.

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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.

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anonymous · Answer

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anonymous · Answer

Let x = the number of scrambled egg plates sold and s = the number of egg sandwiches sold. 
Then 
x + s = 13 
and 
x*1 + s*2 = 21 (where the number of each kind of breakfast is multiplied by the number of toast slices in each breakfast). 
Subtract the first equation from the second equation: 
x + 2s - x - s = 21 - 13 
x - x + 2s - s = 8 
s = 8

anonymous · Answer

Thank you

doc.brown · Answer

scram has 1 toast
sam has 2 toast
some scram and someother sam has 21 toast
scram and sam has 13 breakfasts
sub the scram and sam in the some scram and someother sam to get
some 13 breakfasts minus sam and someother sam  has 21 toast
sam has 8 breakfasts