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Aptitude - Problems on H.C.F and L.C.M - Discussion

Discussion Forum : Problems on H.C.F and L.C.M - General Questions (Q.No. 3)
Problems on H.C.F and L.C.M
3.
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 ?
4
10
15
16
Answer: Option
Explanation:

L.C.M. of 2, 4, 6, 8, 10, 12 is 120.

So, the bells will toll together after every 120 seconds(2 minutes).

In 30 minutes, they will toll together 30 + 1 = 16 times.
2

Discussion:
170 comments Page 12 of 17.
Lal chand said:   1 decade ago
Why 30 is divide by 2, please explain?
Oyinda said:   8 years ago
Why is 1 added to 15 in the last step?
Orbis Roy said:   7 years ago
How to got 120 LCM? please explain me.
Shivam Tiwari said:   7 years ago
Why +1 is done in this can anyone say?
Mehar said:   1 decade ago
WoW...super explanation .thank you:)
Manasa said:   1 decade ago
120seconds is 2 min so divided by 2.
Kinjal said:   9 years ago
Nice Explanation @Sravanreddypailla.
Suja said:   7 years ago
Thank you everyone for the solution.
Yamini said:   7 years ago
Why 1 is added here? Please explain.
Aashish said:   1 decade ago
Thanks sundar. Amazing explanation!
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