29
I'd say you can't. If all the coins are the smallest possible without pennies, they must all be nickels, and 21 of them make $1.05 . So in order for 21 coins to be not more than $1.00, there must be some pennies.
40 pennies 8 nickles 2 dimes
you can make 40 cents withiut using pennies 7 ways
30 pennies, 4 nickels and 5 dimes.
Using pennies, nickels, and dimes: 85 pennies 1 nickel 1 dime Total = 87 coins.
29
I'd say you can't. If all the coins are the smallest possible without pennies, they must all be nickels, and 21 of them make $1.05 . So in order for 21 coins to be not more than $1.00, there must be some pennies.
4 Possible ways
From my calculations, there's only 293 ways to make change for a dollar.
40 pennies 8 nickles 2 dimes
one half dollar; one quarter; one dime; 15 pennies
If you mean by using all the coins then none.
You can use: 1 quarter and 75 pennies 2 quarters and 50 pennies 3 quarters and 25 pennies 4 quarters and no pennies 100 pennies and no quarters
you can make 40 cents withiut using pennies 7 ways
it is impossible to get exactly one dollar with fifty coins. It requires half a nickel and half a penny, which is impossible (12.5 nickels and 37.5 pennies) if there are 12 nickels and 38 pennies, you get 98 cents if there are 13 nickels and 37 pennies, you get 102 cents
2 dimes, 15 nickels, 5 pennies
Using the weight of 2.5 grams per penny, 80 lbs of pennies yield $145.15.