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Playing with Numbers — MATHS STD 6 — Question

ICSE BoardEnglish MediumSTD 6MATHSPlaying with Numbers2 Marks
Question
An electronic device makes a beep after every 15 minutes. Another device makes a beep after every 20 minutes. They beeped together at 10 a.m. At what time will they make the next beep together?
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Answer

11 a.m.

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