L.C.M. of $10, 15$ and $20$ is

$30$

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$60$

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Solution

The correct option is B
$60$

As we know that lowest common multiple is least multiples that are common between the numbers.
Prime factorisation of $10 = 2 \times 5$
Prime factorisation of $15 = 3 \times 5$
Prime factorisation of $20 = 2 \times 2 \times 5$
L.C.M $(10, 15, 20) = 60$
Hence, L.C.M. of $10, 15$ and $20$ is $60 .$

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