If + means x, x means -, ÷ means ÷ and - means + then 60 + 5 ÷ 15 – 20 x 15 = ?

Which number does not fit the following series

0  6  24  60  120  216  336

Which is the missing letter ? A,B,C,D,- ?

If the following words were rearranged in alphabetical order as in dictionary which will income in the third place

5*0.5* 0.05*0.005 = ?

1668 + 8756 - 2817 = ?