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Find the numbers between 400 and 500 which are exactly divisible by 12, 15 and 20.

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440 and 460

420 and 480

420 and 440

440 and 480

answer is B.

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Detailed Solution

$\begin{array}{l} L.C.M. \Rightarrow 3 12, 15, 20 \\ 4 4, 5, 20 \\ 5 1, 5, 5 \\ 1, 1, 1 \end{array}$

L. C. M. $\Rightarrow 60$

So, only 60 multiplies we have to take between 400 and 500

420 and 480

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