Starting at 0 we can count up in 2s like this:
0 2 4 6 8 10 12 14 ...
Example
When we count up in 2s, what comes after 24?
20 22 24 26
Answer
26
Example
When we count up in 2s, what comes before 24?
20 22 24 26 28
Answer
22
Simple, isn't it?
Let's start those questions.