The number of burger sam bought = x
Let the number of burgers for mike be = y
the equation for the total number of burgers will be

Mike brought 5 more than 2 times as many burgers as sam will be represented as

By substituting Eqn 2 in Eqn 1 we will have

Therefore,
The value of x= 15
To calculate the number of burgers mike brought to the BBQ =y,
We will substitute the value of x in (Eqn 1) above
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