Answer:

Bazza cannot be correct as any multiple
of 8 would be even. 


Answer:

1.5, 3, 4.5, 6, 7.5, 9

The twelfth multiple is 18 - double 9.


Answer:

 10, 20, 30, 40, 50, 60, 70, 80, 90 & 100.

When added, they total 550.