Marysia has saved $51.00 in dimes and loonies. If she has 5 dimes fewer than three tenths the number of loonies, how many coins of each type does Marysia have?
A) 10 dimes and 20 loonies
B) 15 dimes and 30 loonies
C) 20 dimes and 40 loonies
D) 25 dimes and 50 loonies