The average website is around 130 KB, so:
1 GB=1 000 MB=1 000 000 KB
1000000/130 = 7692 webpages.
The last answerer believed a Gigabyte to be equal to 1024 MB.
This is a common misconception,; according to the SI standard of
measurement, a different unit is used for products of binary
fission (1,2,4,8,16,32,64,128...1024) called a Gibibyte, or
GiB.