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03.01.2020 •
Mathematics
Five bells begin to ring together and they ring at intervals of 3, 6, 10, 12 and 15 seconds, respectively. how many times will they ring together at the same second in one hour excluding the one at the end?
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Ответ:
60 times will they ring together at the same second in one hour excluding the one at the end.
Step-by-step explanation:
Given : Five bells begin to ring together and they ring at intervals of 3, 6, 10, 12 and 15 seconds, respectively.
To find : How many times will they ring together at the same second in one hour excluding the one at the end?
Solution :
First we find the LCM of 3, 6, 10, 12 and 15.
2 | 3 6 10 12 15
2 | 3 3 5 6 15
3 | 3 3 5 3 15
5 | 1 1 5 1 5
| 1 1 1 1 1
So, the bells will ring together after every 60 seconds i.e. 1 minutes.
i.e. in 1 minute they rand together 1 time.
We know, 1 hour = 60 minutes
So, in 60 minute they rang together 60 times.
Therefore, 60 times will they ring together at the same second in one hour excluding the one at the end.
Ответ:
1300
Step-by-step explanation:
134 is round off to 130
11 is round off to 10
130*10=1300
Actual 134*11=1474