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:
171 comments Page 11 of 18.
Sahil said:
9 years ago
@Anare: it represents that after every 120sec bells toll together.
Nanuram jamra said:
9 years ago
As per my calculation, the correct answer is 15.
Shanmathi said:
9 years ago
Nice post @Sundar.
Kinjal said:
9 years ago
Nice Explanation @Sravanreddypailla.
Kalyan said:
9 years ago
Thanks @Sundar.
Salman pasha said:
9 years ago
But why we should divide episode by 2 (120 sec)?
Lahu said:
9 years ago
@Balaraju Hari.
It is Awesome, Thanks for your explanation.
It is Awesome, Thanks for your explanation.
K.gayathri said:
9 years ago
What is mean by toll?
Mahagopi said:
9 years ago
Thanks for your explanation.
Divyansh said:
9 years ago
Because of all bells ring/toll together after every 2 min (120 s). So to find that how many times all bells tolled together in 30 mins we need to divide the episode i.e. 30 mins by 2 min (120 s).
At last, we add 1 because we have to count all the number of times the bells tolled together in 30 mins, as they started tolling together so their first toll also needs to be counted and hence we add 1 in 15 and get the answer as 16.
At last, we add 1 because we have to count all the number of times the bells tolled together in 30 mins, as they started tolling together so their first toll also needs to be counted and hence we add 1 in 15 and get the answer as 16.
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