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
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LCM of 2, 4, 6, 8, 10 and 12 is 120
120 seconds is 2 minutes
30 minutes...... 30/2 = 15 and 1 at starting
15 + 1 = 16 times
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