At a certain restaurant, 10 sandwiches and 8 burritos will cost $116.60. In addition, 7 sandwiches and 3 burritos cost $69.40. Assuming that we are talking about the same sandwiches and burritos, what is the
cost of 1 sandwich? What is the cost of 1 burrito? Let x represent the cost of a sandwich and y represent
the cost of a burrito.
Equation #1:
Equation #2:
Cost of 1 sandwich:
Cost of 1 burrito:

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.

inverse operation of addition

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.