If someone lost 20 pounds of fat on a diet, where did the fat go?

Well usually when you go on a diet, you don't really want gain weight, when you lose 20 pounds on a diet to 20 pounds that you lost got used as energy for your body, if you eat healthy then you can expect to see weight loss.

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it