if Dave is 21 years old 2014 how how old will he be in 2020

21 + 6 = ?

The answer is 27.

To determine how old Dave will be in 2020, we need to calculate the difference in years between 2020 and 2014 and then add that difference to Dave's age in 2014.

First, let's find the difference in years between 2020 and 2014:
2020 - 2014 = 6

The difference is 6 years.

Next, we add this difference to Dave's age in 2014:
21 (Dave's age in 2014) + 6 = 27

Therefore, Dave will be 27 years old in 2020.