Katie gave Melanie $2.45 in dimes and nickels. If 10 coins were dimes how many coins were nickels? Which equation models this problem? A. 2.45 • 10 - 5n B. 0.05n + 2.45d = 10 C. 10 • 0.10 + 0.05n = 2.45 D. 0.05 • 10 + 0.1 • d = 2.45