Question

An electronic gadget produce light after 15 minutes whereas electronic rod gives light after 20 minutes they produce light together at 12:00 a.m. at what time will they produce light together ? ​

Answer 1

In the above Question , the following information is given -

An electronic gadget produce light after 15 minutes .

An electronic rod gives light after 20 minutes.

They produce light together at 12:00 a.m.

To find -

The next time when they will produce light again .

Concept Used -

LCM and HCF

Solution -

Here , we have to find the next time when they will produce light again .

So , this means that we have to find the LCM of the different timings .

So.,

Here -

An electronic gadget produce light after 15 minutes .

An electronic rod gives light after 20 minutes.

LCM of 15 and 20

5 |__15, ___20__

1 |___3____4__

So .

LCM

=> 5 × 3 × 4

=> 60 minutes .

We know that -

1 hour = 60 minutes .

So.

The two lights will blink again after an hour .

They first blinked at 12 : 00 am .

So, they will blink again at 1 : 00 am ... Answer

_______________

Additional information -

LCM × HCF = Product of Numbers