Question

Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respectively. Find how many times the bells toll together in two hours and at what intervals they toll together?

Answer 1

First find L.C.M of 6,7,8 and9

Answer 2

ok. 504.

Answer 3

Are u sure

Answer 4

ya... thats right

Answer 5

So, the four bells will ring afer 540 seconds all together

Answer 6

got it?

Answer 7

504.

Answer 8

now, 2 hour = ---- seconds

Answer 9

But it says they ring together at intervals of 6, 7, 8, 9 seconds.

Answer 10

So what have these numbers got to do with 504?

Answer 11

Since the Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respectively

Answer 12

they will ring together after 540 seconds now

Answer 13

PLZ read the question carefully

Answer 14

So after that nine seconds, they will ring together after 504 seconds?

Answer 15

nope.....

Answer 16

Lets say they ring together first at 6.00.00.
Then at 6.00.06
6.00.07
6.00.08
6.00.09
right?

Answer 17

nope.....

Answer 18

Let me first expalin the question

Answer 19

there are four bells

Answer 20

which ring together at first

Answer 21

then BELL A rings after 6 seconds, BELL B rings after 7 seconds , BELL C rings after 8 seconds and BELL D rings after 9 seconds

Answer 22

got it?

Answer 23

yep i got it now.

Answer 24

so what do u think 540seconds means

Answer 25

2 hours = 2 * 60 * 60 seconds
= 3600 * 2
= 7200 seconds

Answer 26

The three bells will ring TOGETHER every 504 seconds right?

Answer 27

right

Answer 28

OK, I know how to do it now. Thanks!!

Answer 29

WELCOMX