It's pretty straightforward and simple:
Six more means + 6.
Twice a number means 2n.
Is 16 means = 16
Now combine these three definitions and you will receive:
6 + 2n = 16
Now solve this simple equation:
6 + 2n = 16
2n = 16 - 6
2n = 10
n = 10 / 2 = 5
So the correct answer is D.
