Final answer:
The common ratio in the given geometric sequence is 5.
Step-by-step explanation:
In a geometric sequence, each term is obtained by multiplying the previous term by a constant number called the common ratio. To find the common ratio in the given sequence, we can divide any two consecutive terms.
Let's divide the second term (20) by the first term (4):
20 / 4 = 5
So, the common ratio in the given geometric sequence is 5.