What is the interquarite range of 12 16 20 24 28 32 36 40 44 48

Is the answer 20?

That's how I got the answer.

The sequence number is already arranged in ascending order. So what I did is Separate the sequence number into 2 part.

First part is the first 5 digits while the second part is the last 5 digits. Then, choose the middle number in each of the 5 digits. Use the larger number to minus the smaller number.

40-20 = 20