Jane Has 15 Phone Cards Worth Either $20 or $15

Multiple Choice

Jane has 15 phone cards worth either $20 or $15. How many of each does he have if the phone
Cards total $245?

A) three $20 cards and twelve $15 cards
B) eleven $20 cards and four $15 cards
C) four $20 cards and eleven $15 cards
D) seven $20 cards and seven $15 cards