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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:
172 comments Page 17 of 18.
GSS said:   8 years ago
Thnaks @Sravanreddy.
Riya said:   8 years ago
Thanks @Sravanreddy.
Dive_nithi said:   7 years ago
Thank you for your excellent explanations @Sravanreddy.
ASHNA said:   7 years ago
Thanks @Saravan and @Deepak.
Adithya said:   7 years ago
Thank you @Sundar.
Michael said:   7 years ago
Why 1 is added? Explain it.
Raksha said:   7 years ago
Why 1 is added please explain?
Shahrukh said:   7 years ago
Why is 1 being added? How can at 0 sec they toll together? So why adding 1? When 1st toll is after 2 min then at 30th min they will toll 15th time. Thats it.
Sirichandana said:   6 years ago
Very well said, thanks @Sravan.
Avinash said:   6 years ago
@Shahrukh.

Here, it is mentioned that the bell starts after tolling thas why we add 1.
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