13. Three bells start ringing together at
8:30 am. If they ring after 10, 12, and 15.
minutes respectively each time. The next time
they will ring together at.
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Answer:
Next time They will be ringing after 19 minutes
Explanation:
Because after 10 the time is increasing in the jump of 10+2=12.Now12+3=15and then obviously 15+4=19
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