Each coin is a half-dollar. If you have five coins that equal 50 cents, then you have five half-dollars. Each half-dollar equals 50 cents.
25 cents + 5 cents + 5 cents + 1 cent + 1 cent = 37 cents
two quarters, that's simple.
Three nickels, ten pennies.
Three dimes, three nickels, five pennies
Two quarters, one dime, four nickels, five pennies
Hmmmm. This is a trick question, huh. The two US coins that total fifty-five cents are a fifty-cent piece and a five-cent piece. The fifty-cent piece is the one that is not a nickel.
Five one cents equal 5 cents.
Could the original question be "You have two coins that equal fifty-five cents and one is not a nickel"? If so, the answer would be "one is a half-dollar (not a nickel) and the other one is a nickel".
Two dimes and five pennies make 25 cents -- seven coins in all.