There are no set number of pounds of anything that will be in a tablespoon. The number of pounds in a tablespoon of something depends on what that something is.

That depends on where you are. Something that weighs 400 pounds on Earth has 181.4 kilograms of mass. Something that weighs 400 pounds on the Moon has 1,096.3 kilograms of mass. Something that weighs 400 pounds on Jupiter has 68.7 kilograms of mass.

On earth: 1 kg mass weighs about 2.2 pounds. Something that weighs 6.4 pounds has mass of about 2.9 kilograms . On the moon: 1 kg mass weighs about 0.36 pounds. Something that weighs 6.4 pounds has mass of about 17.8 kg.

It depends on where you're weighing it. -- Something that weighs 185 pounds on Earth has 83.915 kilograms of mass. -- Something that weighs 185 pounds on the moon has 507.056 kilograms of mass. -- Something that weighs 185 pounds on Jupiter has 31.793 kilograms of mass.