You can put this solution on YOUR website! Let n = the number we are looking for
24 + (1/2)(n) = 2n
24 + (n/2) = 2n
We now multiply every term by 2 to remove the fraction.
48 + n = 4n
48 = 4n - n
48 = 3n
48/3 = n
16 = n
The number we are looking for is 16.
Understand?