Alice has a total of 12 dimes and nickels. She has 2 more nickels than dimes. Which equation represents the given problem situation?
1: c + 2c=12, where c is the number of nickels
2: c + 2c=12, where c is the number of dimes
3: c + (c + 2)=12 where c is the number of dimes
4: c + (c + 2)=12 where c is number of nickels​