$$= \frac { 400 \times 10 \times 9 \times 3 \times 4 } { 20 \times 8 \times 4 \times 1 }$$
$675$
$$3\times 5\times 5\times 9$$
$$15\times 5\times 9$$
$$75\times 9$$
$$675$$
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$3^{3}\times 5^{2}$
