Q.
A. 4
B. 10
C. 15
D. 16
E. None of the above
Correct choice: D
Explanation:
L.C.M. of 2, 4, 6, 8, 10, 12 is 120.
So, the bells will toll together after every 120 seconds(2 minutes).In 30 minutes, they will toll together (30/2) + 1 = 16 times