Verbal Reasoning - Mental Ability Questions

If 40@8 = -5, 30@3 = -10 and 20@5 = -4, then find the value of 60@3 = ?

If 5 x 4 x 0 = 405
3 x 2 x 8 = 283
then 1 x 7 x 6 = ?

Which number will complete the series?
1,8,27,64,125,216,________

In the following question, select the missing number from the given series.
1, 3, 6, 10, 15, ?

In the following question, select the missing number from the given series.
1, 3, 6, 11, 18, ?

A girl is standing facing towards the east. She turns 45 degree in the anticlockwise direction and then turns 180 degree in the clockwise direction. Which direction is she facing now?

What should come in place of the question mark (?) in the following number series? 1, 3, 24, 360,8640, 302400, ?

If "α" denotes "subtracted from", "β" denotes "multiplied by", "θ" denotes "added to" and "δ" denotes "divided by", then 10 θ 8 β 4 δ 8 α 9 = ?