Find the LCM of the three bells that is 20,40,30.The answer you get is 120 minutes which is equal to 2 hours. Then add the LCM(2 hours) to 10.00am which gives the answer as 12.00 at noon.
Take the answer (12.00) and add 4 hours which will give the answer of the third time they will ring together. You get 16.00 which is equal to 4.00pm
Elcis answered the question on November 14, 2017 at 10:47
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