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.