Respuesta :

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Find the Lowest Common Multiple:

In this case, it is 90

Add 90 minutes to 8:30

The next time they will ring together is 10:00

Hope This Helps You!

Good Luck (:

Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ

The next time they will ring together is 10:00