Gilly has $$560$$ marbles. She puts them into three boxes, $$A$$, $$B$$ and $$C$$. She puts $$80$$ marbles in Box $$A$$. She puts twice as many marbles into Box $$B$$ than in Box $$C$$. How many marbles are there in Box $$C$$? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Problems of Sum and Multiple