Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 73.0 g of gold?

You would have to dig up 261 g of sylvanite.

Mass of sylvanite = 73.0 g Au × (100 g sylvanite/28.0 g Au) = 261 g sylvanite.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

b. is the answer hoped i