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Real Numbers
RD Sharma
CBSE
Grade 10

Question:

Three bells toll together at intervals of $9, 12, 15$ minutes respectively. If they toll together now, after how much time will they toll together next?
(a) $180$ minutes
(b) $90$ minutes
(c) $360$ minutes
(d) $45$ minutes

Step-by-Step Solution

Key Concept: $\text{LCM}(9, 12, 15) = 180$ minutes.
$\text{LCM}(9, 12, 15) = 180$ minutes. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Evaluating $\text{LCM}(9,12,15) = 180$: 1.0 Mark

Correct Answer: $180$ minutes
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