Are you using British or American pennies. I have access to neither, but suspect you do. Just weigh a few - say ten; and that'll give you a good idea of their weight.
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you can make 40 cents withiut using pennies 7 ways
None. If you "get 65 cents using only dimes nickels and quarters" you are not using any pennies!
1 dime 2 nickels 1 nickel, 5 pennies 10 pennies
40 pennies 8 nickles 2 dimes
Using pennies, nickels, and dimes: 85 pennies 1 nickel 1 dime Total = 87 coins.