How much is 3 pounds of nickels worth?

Assuming you're referring to American nickels:

- each coin weighs 5 gm

- a US pound is 453.6 gm, so 3 pounds = 1361 gm.

- dividing 1361 by 5 gives 272 nickels, to the nearest whole amount

- finally, 272 * $0.05 = $13.60