The riddle asks, “How many of us are there?” based on the statement:

“I have 4 brothers, and each brother has 4 brothers.”

Let’s break it down:

• You have 4 brothers, which means there are 5 brothers in total (including yourself).
• Each of your 4 brothers also has 4 brothers, which refers to the same 5 brothers (including you).

So, the total number of “us” is 5 brothers.