Question

The alarms on two mobile phones ring together once.If one rings every 15 minutes and the other rings every 25 minutes, after how many minutes will they ring together again ?​

Answer 1

Given that oe mobile phone rings every 15 minutes while the other rings evey 25 minutes.

So, they will ring together after , let x minutes.

Then,

x = LCM ( 15,25)

==> x = 75

So, They will ring together again after 75 minutes.

Answer 2

Answer:

LCM of 15 and 25=75

So, definitely the alarms on two mobiles will ring together after 75 minutes i.e., 1 hour 15 minutes.