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Method 1:

$284.78 is the same as 28,478 cents. Dividing by 20 gives 1423.9 twenty-cent coins

Method 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.

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9y ago

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