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)
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 ?
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 7 of 17.
Prem said:
1 decade ago
I am unable to understand why we are using lcm method for this problem. Can anyone explain?
Bahhep said:
9 years ago
In 30th min they meet together but they don't toil together. So it should be 15 not 16.
Avinash said:
5 years ago
@Shahrukh.
Here, it is mentioned that the bell starts after tolling thas why we add 1.
Here, it is mentioned that the bell starts after tolling thas why we add 1.
Prasanth v said:
7 years ago
30/2=15.
And 15+1=16 (added +1 reason is first 0 to 2 sec bell is tolled at a time).
And 15+1=16 (added +1 reason is first 0 to 2 sec bell is tolled at a time).
Ashish said:
1 decade ago
Forget about 30/2, look at the answer given by Sravan. 1800/120=15
Thanks Sravan.
Thanks Sravan.
Neem said:
1 decade ago
Can you please tell me how to calculate LCM of above series no. ? Please tell me.
Bhavadip Gothadiya said:
7 years ago
Anyone explain to me, why to add additional 1?
Why (30/2) +1 instead of (30/2)?
Why (30/2) +1 instead of (30/2)?
Rahul said:
7 years ago
Total 30 mins 1800 secs.
Coincide at 120 sec.
Divided the 1800/120=15+1=16.
Coincide at 120 sec.
Divided the 1800/120=15+1=16.
Priyansh said:
1 year ago
The reason we added 1 in the answer "Six bells commence tolling together".
(21)
Surajbhan singh said:
6 years ago
Why 1 is added your answer in the question. Read it once again carefully.
(1)
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