Question: how much is 30 lbs of quarters worth?
Answer: Turns out that $10 in quarters weighs half a pound. Which means one pound of quarters (which individually weigh 5.67g), naturally, adds up to $20. Handy, I thought. Looking at the United States Mint's coin specifications page, I learned that, at 2.268g per dime, one pound of dimes also equals $20.