Question

There are different types of bells. The red bell rings every 18 minutes, the yellow bell rings every 12 minutes and the green bell rings every 12 minutes? A) What is the LCM of 3 ringing bells? B) If the bell ring together at 6 pm, what time will they ring together next time?​

Answer 1

Answer:

5:00 pm

So first you find the LCM, or least common multiple, (can be called LCD, least common denominator).

The LCM of

20

,

30

, and

50

is basically

10

⋅

2

⋅

3

⋅

5

because you factor out the

10

since that is a common factor.

10

⋅

2

⋅

3

⋅

5

=

300

This is the number of minutes. To find the number of hours, you simply divide by

60

and get

5

hours. Then you count

5

more hours from

12:00 pm

and get

5:00 pm

.

Answer 2

Answer:

A) LCM of the 3 ringing bells is 36

B) at 6:36 pm

Explanation :

first find the LCM of the given 3 numbers 18,12,12.

the LCM of 18,12,12 is 36

and together the bells rings 36 min later when the first bell was ringed.