A clock chimes every 20mins

Mathematics

1 answer:

Delicious77 [7]3 years ago

8 0

Answer: 6 times

Step-by-step explanation:

it is a lowest common multiple question. So we list the multiples

20 8

40 16

60 24

80 32

40

40 is our lowest common multiple. Which means every 40 minutes they flash and chime together.

so if we add 40 minutes onto 08:00 we get 08:40 and if we add it again we get 09:20 and again we get 10:00 and again we get 10:40 and again we get 11:20 and again we get 12:00. We have to stop here as if we add 40 minutes again we will go over the given time of 12:30. If we count how many times it was added. this adds to 6. therefore the answer is 6.

hope this helped.

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