Question

4. A church has two bells. One bell rings every 4 hours and the other rings every 5 hours. At which hour during the day, will both the bells ring together?​

Answer 1

Answer:

20

Step-by-step explanation:

We have to take L.C.M

LCM of 4 and 5 is 20

So, your answer is 20

Answer 2

Step-by-step explanation:

In order to find when all three will ring together again. We have to find the LCM of 3,6 and 15

3=3

6=2×3

15=3×5

Therefore, LCM of 3,6 and 15 is

LCM=2×3×5=30

Hence, All three bell will ring together after 30 Minutes