Grouping: $$5+15+17+23=60$$  $$60\times3=180$$ 
What is the sum of the following numbers?  $$5+15+17+23+5+15+17+23+5+15+17+23=$$ 
(a) $$140$$ 
(b) $$160$$ 
(c) $$180$$ 
(d) $$240$$ 
(e) None of the answer above 