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Answer 1 · 2017-01-07T12:10:52

The number of calories in a single Big Mac is #540#.

We consider the Big Mac as #x# and the two small fries as #y#. From the data:

#x+y=1000#
#3x+y=2080#

Subtracting the first equation from the second equation, we get:

#(3x+y)-(x+y)=2080-1000#

Open the brackets and simplify. The product of a negative and a positive is a negative.

#3x+y-x-y=2080-1000#

#2x=1080#

Divide both sides by #2#.

#x=540#