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:
172 comments Page 5 of 18.
Deepak said:
2 decades ago
@neem
2=2
4=2*2
6=2*3
8=2*2*2
10=5*2
12=2*2*3
nw select d max count for 2 3 5
for 2. Its in 8. I.e. 2*2*2.
Then 5 n 3 are only once in any combination.
So lcm=2*2*2*3*5=120
2=2
4=2*2
6=2*3
8=2*2*2
10=5*2
12=2*2*3
nw select d max count for 2 3 5
for 2. Its in 8. I.e. 2*2*2.
Then 5 n 3 are only once in any combination.
So lcm=2*2*2*3*5=120
Krishna said:
2 decades ago
Thank you Sravan I got it.
Gayatri said:
1 decade ago
Thank u deepak...
Ali said:
1 decade ago
Excellent explanation sravanreddy
Nimmi said:
1 decade ago
But why have counted till 120. ?
Rahul said:
1 decade ago
Thanks Sravanreddypailla. Its truly good.
Vairam said:
1 decade ago
Why 1 is added?
Naveen said:
1 decade ago
Really good explnation.
Lakshmisha said:
1 decade ago
@Sravanreddypailla, excellent dude...!!!
Sangeeta said:
1 decade ago
I didn't understand why did we add 1?
Please explain.
Please explain.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers