A golden padlock weighs 4/5 of a pound, but only 3/4 of the padlock is real gold. How
many pounds of real gold are in the
padlock?

for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d