You are getting ready to move and have asked some friends to . for lunch, you guy the following sandwiches at the local deli for $30; six tuna sandwiches and six turkey sandwiches. later at night, you again buy 4 tuna sandwiches, and 8 turkey ones for $30. 60. what is the price of each sandwich?

Let  x = price of a tuna sandwich
Let  y = price of a turkey sandwich

(1) 6x + 6y = 30
(2) 4x + 8y = 30.6

(1) x + y = 5

(2) 40x + 80y = 306
(2) 20x + 40y = 153

Multiply both sides of (1) by 20
and subtract (1) from (2)
(2) 20x + 40y = 153

(1) -20x - 20y = -100

20y = 53
y = 2.65
and
(1) x + y = 5
(1)  x + 2.65 = 5
(1)  x = 2.35

A tuna sandwich costs $2.35

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127 millimeters is the answer