Thirty thousand pennies weigh approximately 66.14 pounds (30 kg). Each penny weighs about 2.5 grams, so when you multiply that by 30,000, you get 75,000 grams, which converts to roughly 66.14 pounds.
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30000 pennies are worth exactly $300. In the UK 30,000 pennies are worth £300.00
Depends on whose pennies (which country) and the force of gravity which is not uniform.
167,500 grams
1 billion pennies would weigh 5,511,556.55 pounds. The weight of a penny is 2.5 grams
7,142 pennies weighs about 39.4 (39.3635369)pounds.