Two quarters, one dime, four nickels, five pennies
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3 quarters & 2 nickels
22
Well, honey, you've got yourself a math problem. To make 85 cents using those coins, you can have combinations like 1 fifty cent coin, 1 twenty-five cent coin, 1 five cent coin, and 1 five cent coin. That's just one way to do it, but there are multiple combinations you can come up with to make a total of 85 cents using those coins.
To make 85 cents using the fewest coins possible, you would need one 50-cent coin (a half dollar), one 25-cent coin (a quarter), and one 10-cent coin (a dime). This combination totals 85 cents.
To make 89 cents with 6 coins, you have to first realize that the "9" part of the cents is comprised of 5 cents and 4 pennies. Therefore, you have to have 4 pennies and 85 cents using 2 coins; impossible, since you would need 3 coins(if you had half-dollars) to make that amount: a half-dollar, quarter, and a dime. Basically, it's impossible with only coins worth 0.01, 0.05, 0.10, 0.25, and 0.50 of the currency(US$, I assume?)