five
1.00 / 0.20 = 5
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20 = 100 / 5
20 five cent coins add up to a dollar
Method 1:$284.78 is the same as 28,478 cents. Dividing by 20 gives 1423.9 twenty-cent coinsMethod 2:20 cents is 1/5 of a dollar, so there are 5 times as many 20-cent coins as dollars in that amount. 284.78 * 5 also equals 1423.9 twenty-cent coins.Because you can't have 0.9 of a coin, there are 1423 coins, with 18 cents left over.
The answer will depend on which country's dollar, and therefore what he coins are. The US has a 25 cent coin but not a 20 cent coin. Australia is the other way around. There is no indication in the question which one you mean - if either. there are many more countries that use a dollar as their main currency unit.
5*20 cents (Australian) make a dollar. In US and Canadian coins, a 50 cent piece, a quarter, two dimes, and a nickel also make a dollar.