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Who knows? I suppose you could look up the dimensions of a penny and calculate an answer based on hexagonal packing. But even if you're lazy I think the easiest way to find out (without cheating) is to actually get a stack of pennies and count how many fit on a card, in other words, do the experiment!
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Is a 3x5 card a golden rectangle?
A golden rectangle is a rectangle whose side lengths are in the golden ratio, approximately 1:1.618. A 3x5 card has side lengths of 3 inches by 5 inches, which do not match the golden ratio. Therefore, a 3x5 card is not a golden rectangle.
How many common house flies can fit one layer deep on a 3 inch by 5 inch card?
200 flies can fit on a 3x5 inch card.
How many rectangles are in a 3x5 grid made out of squares?
60
What is the LCM for 1080 and 200?
1080 = 2^3x3^3x5 200= 2^3x5^2 LCM (1080,200) = 2^3x3^3x5^2 = 1800
How many sheets of plywood do you need to cover 3X5 and 2X4 windows?
Divide the area of the windows by the area of the sheets. Note: 3x5 and 2x4 are not areas, they are numbers. And you don't say how big the sheets are, so it is difficult to be helpful.
