system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does Egypt know the exact number of ISIS members they've killed after they dropped the bomb?
gpt
Unless they have boots on the ground to count the bodies, they don't.  They are estimates.

There are ways to use infrared cameras to estimate the number of people in a building or location before/after the destruction, but they are still only estimates, rather than accurate numbers.