Calculate how many seconds it will take for 4 bells to toll together again, given that they begin to toll together respectively at the intervals of 9, 12, 15 and 18 seconds? Options:
A) 186
B) 130
C) 180
D) 181
E) 120
L180M of 9, 12, 15 and 18 is   180   L180M=180   ANSWER:180
<result>C</result>
Calculate how many seconds it will take for 4 bells to toll together again, given that they begin to toll together respectively at the intervals of 9, 12, 15 and 18 seconds?