Question

Find the smallest square no. which is divisible by each of the numbers $8,15$ and $20$.

Answer 1

$8=2\times 2\times 2$
$15=3\times 5$
$20=2\times 2\times 5$
$L.C.M=2\times 2\times 2\times 3\times 5=120$
Required no. $=120\times 3\times 5=1800$