Question 750562: Three bells ring at the interval of 10,15 and 20 minutes respectively . If they all ring at 11 a.m at once,what time they ring together again ? Please show process also and answer also.
Found 3 solutions by FrankM, reviewermath, ankor@dixie-net.com:
Answer by FrankM(1040)   (Show Source):
You can put this solution on YOUR website! We need the lowest common multiple of 10,15,and 20
10 = 2*5
15 = 3*5
20 = 2*2*5
These are the prime factorization for these numbers.
2*2*3*5 = 60 This is the lowest common multiple.
Noon is the answer.
Answer by reviewermath(1029)  (Show Source):
Answer by ankor@dixie-net.com(22740)  (Show Source):
You can put this solution on YOUR website! Three bells ring at the interval of 10,15 and 20 minutes respectively .
If they all ring at 11 a.m at once,what time they ring together again ?
:
Find the least common multiple of 10, 15, 20,
Prime factor
10: 2*5
15: 3*5
20: 2*2*5
then
2*2*3*5 = 60 is LCM
:
60 min from 11 is 12
|
|
|
