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?)
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To make 95 cents using 6 coins, you can use the following combination: three quarters (75 cents), one dime (10 cents), and two pennies (2 cents). This adds up to a total of 95 cents using exactly 6 coins.
3 dimes, 1 nickel, and 2 cents.
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To make 75 cents using 10 coins, you can use the following combination: 3 quarters (25 cents each) and 7 nickels (5 cents each). This adds up to a total of 75 cents using 10 coins in total.