

Problems on HCF and LCM - General Aptitude
Q1: 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 ?A 4
B 10
C 15
D 16
ANS:D - 16 L.C.M. of 2, 4, 6, 8, 10, 12 is 120. So, the bells will toll together after every 120 seconds(2 minutes).
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