Question

bell A rings every 4 min and bell A rings every 5 min. At what no of min will they ring together​

Answer 1

$\huge\bold\red{Question}$

• bell A rings every 4 min and bell B rings every 5 min. At what no of min will they ring together.

$\huge\bold\red{Solution}$

Hey mate! As we are given with two different times and have to decide a particular time at which both the bells will ring together , we will find the L.C.M. (Lowest common multiple).

$\small\rm\purple{Bell \: A}$

$\small\rm\purple{Bell \: B}$

• $\small\rm\purple{=>1|4,5}$

As we need two numbers to get divided by the other number but here 4 and 5 so not have any same multiple so we will simply multiply both of those numbers to get the L.C.M.

• $\small\rm\purple{=>4×5}$
• $\small\rm\purple{=>20}$

:.The L.C.M. got is 20 i.e.,20 minutes.

So the bells A and B will ring together after every 20 minutes.

Answer 2

20 is the answer of the question.