$$2$$ years time, Amanda $$10$$ and sister $$5$$. Total $$15$$.  This year, $$15-2-2=11$$. 
Amanda is $$7$$ years old last year. In $$2$$ years times, she is double of her sister\textquotesingle s age. What is the sum of their age this year? 

1. $$11$$ 
2. $$12$$ 
3. $$13$$ 
4. $$14$$ 
5. $$15$$ 