Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively.
In 30 minutes, how many times do they toll together? Options:  A) 12  B) 14  C) 15  D) 16  E) 17
Explanation :   Here's the simple solution :   Take lcm of 2,4,6,8,10,12 seconds   The outcome is 120seconds.   Convert it into minutes = 120 / 60= 
<gadget id="calculator">120 / 60</gadget>
<output>2</output>
2 minutes   In 30mins it will rings 15times together   But ,In 0th second all bells rings together   Hence Total number of bell rings is= 15 + 1= 
<gadget id="calculator">15 + 1</gadget>
<output>16</output>
16   Hence (D) is the correct answer.   Answer : 16
<result>D</result>
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively.
In 30 minutes, how many times do they toll together?