It would be easier to translate this into mathematical terms first.
Let n = the unknown number
6n > n + 20
Subtracting both sides by n to simplify:
6n - n > n + 20 - n
5n > 20
Dividing both sides by 5:
5n/5 > 20/5
n > 4
Among the choices, the correct one is the second choice.
