 
 <translate> The total of twelve numbers = 12X7 = 84
The total of first 9 and last 2 numbers is = 9 X 6+2 X 10 = 74
So, the middle number is (84 - 74 ) = 10
The answer: (B). <ibo> Nchịkọta nke nọmba iri na abụọ = 12X7 = 84 Nchịkọta nke nọmba 9 mbụ na nọmba 2 ikpeazụ bụ = 9 X 6 + 2 X 10 = 74 Ya mere, ọnụọgụ dị n'etiti bụ (84 - 74 ) = 10 Azịza ya bụ: (B). 