You need to start with the following information:
- Coins are weighed in grams. A US nickel weighs 5.0 gm; a current Canadian nickel is 3.95 gm.
- A US pound is 453.6 gm so 16 pounds = 453.6*16 = 7257.60 grams
That means 16 US pounds of:
- American nickels is 7257.60 / 5.0 = 1452 coins (rounded to the nearest whole number); the value is US$72.60
- Canadian nickels is 7257.60 / 3.95 = 1837 coins (also rounded); the value is CDN$91.85