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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 $2$ .

$x=540$