Advertisements
Advertisements
प्रश्न
Three bells toll together at intervals of 9, 12, 15 minutes. If they start tolling together, after what time will they next toll together?
विकल्प
1 hour
- \[1\frac{1}{2}\] hours
- \[2\frac{1}{2}\] hours
3 hours
Advertisements
उत्तर
3 hours
The L.C.M. of 9, 12, and 15 will give us the minutes after which the bells will next toll together.
L.C.M. = 22 × 32 × 5
= 180
So, the bells will toll together after 180 min.
On converting into hours:
180/60 = 3 hours
APPEARS IN
संबंधित प्रश्न
Test the divisibility of the following numbers by 5:
35208
Test the divisibility of the following numbers by 5:
124684
Test the divisibility of the following numbers by 9:
2358
Test the divisibility of the following number by 10:
55555
Test the divisibility of the following number by 11:
8790322
Test the divisibility of 10001001 by 3.
Write (T) for true and (F) for false against the following statement:
A number is divisible by 18 if it is divisible by both 3 and 6.
Find the greatest number which divides 615 and 963, leaving the remainder 6 in each case.
Find the greatest number which divides 2011 and 2623, leaving remainders 9 and 5 respectively.
Using divisibility tests, determine which of the following numbers are divisible by 2; by 3; by 4; by 5; by 6; by 8; by 9; by 10; by 11 (say, yes or no):
|
Number |
Divisible by |
||||||||
|
2 |
3 |
4 |
5 |
6 |
8 |
9 |
10 |
11 |
|
|
128 |
Yes |
No |
Yes |
No |
No |
Yes |
No |
No |
No |
|
990 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
1586 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
275 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
6686 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
639210 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
429714 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
2856 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
3060 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
|
406839 |
______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ | ______ |
