
Michael C. answered 04/09/20
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I would answer this problem by rewriting it so that it is simpler:
(3x1)+(3x1/10)+(9x1/1000) =
(3) + (3/10) + (9/1000) =
33/10 + 9/1000 =
3309/1000 or 3 and 309/1000 or 3.309