Suppose you have four 500 mb hard drives plus one 2 gb flash drive. how many gb of capacity is this overall?

You would have a total of 2.5 GB of capacity.

A gigabyte consists of 1000 megabytes, so 500 megabytes make half of a gigabyte, or 0.5 gigabytes.

So 2GB + 0.5GB = 2.5GB

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