Many countries use cents as a minor currency unit and their 50 cent coins are not all the same size. Since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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The diameter of an Australian Five cent coin is 19.41 mm. It would take about 103 Five cent coins to stretch 2 Metres.
Which currency are you using? Twenty-cent coins don't exist in the United States anymore.
20 / 5 = 4 328 / 4 = 82
it's possible only if there are 20 cent coins only for that 7 dollars 1 dollar = 100 cents, 100 cents = 5 of 20 cent coins since you need 5 of 20 cent coins for a dollar, you do 7 times of it. 7 X 5 = 35. Therefore, you need 35 of 20 cent coins for 7 dollars. (or there are 35 of 20 cent coins in 7 dollars)
An Australian Twenty cent coin weighs 11.31 grams, so there would be about 88 Twenty cent coins in a Kilogram.