How many switch ports on the access layer switches will be available in the switch block to support end device (in the case below)?

There will be 176 ports to support end devices. However, this is one word problem that I am unable to figure out by myself; this was the answer given by the person before me. The four ports by themselves will offer 192 ports. From there, I have no idea how to get the end number of ports. I would assume that you would double it to get to the next step, which gives you 384 ports. I have no idea what the 10 gigabit and 20 gigabit ports have to do with this.

So, I personally would put 384 ports, but since this is beyond my technological literacy, I cannot be any more specific than that. I think the person who came before me ought to expand the answer so that others can see how you got it.