Only one penny is required, if it is moving fast enough to puncture the hull. If you are talking about the weight of the pennies, then aluminum boats come in various sizes, so they do not all have the same penny carrying capacity. A ten foot long aluminum rowboat can carry a million pennies without sinking. Try it.
The question depends on what the aluminium is floating in. It is denser than water so will sink a block will sink in water without any pennies. If, on the other hand, it is shaped (like a boat) then the number of pennies required will depend on the shape.
5 pennies make a nickel.
10,000 pennies make 1,000
3 trillion pennies make 3 trillion pennies. 300 trillion pennies make 3 trillion dollars.
5 pennies
Yes, many boats are made from aluminum.
16000000 pennies
22 pennies
It would depend on how many pennies they had!
15 million pennies
100 pennies
100 pennies
25 pennies. Or 25 cents.
It is 10,000 pennies
100 trillion.
Strangely enough, a million pennies make a million [pennies].
100 pennies = £1£3500 = 3500 * 100 = 350,000 pennies