Seven bells commence tolling together and toll at intervals of 3, 6, 9, 12, 15, 18 and 21 s respectively. In 300 mins, how many times do they toll together?
Explanation:
LCM of 3, 6, 9, 12, 15, 18 and 21 is 1260.
So, the bells will toll together after every 1260 s, i.e. 21 mins.
In 300 mins, they will toll together for (300/21) + 1 = 15 times.
Hence, option (d).
» Your doubt will be displayed only after approval.
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.