Ethan has 1.25 in dimes, nickels, and pennies he has twice as many dimes as pennies, ant the number of pennies. how many dimes, nickels, and pennies does he have?

Each group of 2 dimes and 1 penny has a value of $0.21. Since the remaining coins are nickels and the total is a multiple of $0.05, there must be 5 groups of dimes and penny, for a total of $1.05 in those coins.

Ethan has 5 pennies, 10 dimes, and 4 nickels.