If a*b denotes the greatest common divisor of a and b, then ((12*16)*(30*24)) = ? Answers:
A) 24
B) 12
C) 6
D) 4
E) 2
The greatest common divisor of 12 and 16 is 4. Hence 12*16 = 4 (note that * here denotes the function not multiplication).   The greatest common divisor of 30 and 24 is 6. Hence 30*24 = 6.   Hence ((12*16)*(30*24)) = 4*6.   The greatest common divisor of 4 and 6 is 2.   Answer; 2.
<result>E</result>
If a*b denotes the greatest common divisor of a and b, then ((12*16)*(30*24)) = ?