Six bells commence tolling together and toll at intervals of 1,2,3,4,5,6 seconds respectively. In 30 minutes, how many times do they toll together? Choose the most appropriate option:	A) 44	B) 31	C) 15	D) 16	E) 17
L.C.M of 1,2,3,4,5,6 is 180. i.e after each 1 min they will toll together.So in 30 min they will toll 30 times.As they have initially tolled once,The answer will be  30+1= 
<gadget id="calculator"> 30+1</gadget>
<output>31</output>
31.   ANSWER:31
<result>B</result>
Six bells commence tolling together and toll at intervals of 1,2,3,4,5,6 seconds respectively. In 30 minutes, how many times do they toll together?