Janine thinks of three numbers. Between them, they use the digits $$1$$, $$3$$, $$5$$, $$6$$, $$7$$, $$8$$ and $$9$$, with each digit being used exactly once. The second number is $$2$$ times the first number. The third number is $$4$$ times the first number. What is the third number? (2020AMC 26) 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples