A truck driver was going south on I-75, when he came upon a weight station. When he pulled in and got on the scales to be weighed, the scale master told the driver that he was 900lbs. over weight. The truck driver replied, I can take care or that. The scale master asked he how could he fix the problem? The driver said, let me go around back, and I'll fix the overweight problem. The scale master agreed to let him fix his problem. About half an hour later the truck driver got back on the scales, and the scale master said, driver, you are still 900lbs. over weight. The truck driver said, I don't understand what went wrong. I let 50lbs. out of each tire on the rig. After thinking the problem over the scale master said, well 18 tires times 50lbs. would equal 900lbs. I guess my scales must be wrong. I'm sorry driver, you may continue on down the road, and have a nice day.