$$\frac{400}{60}\times\frac{60}{30}\times\frac{90}{30}$$
$40$
$$\frac{20}{3}\times \frac{60}{30}\times \frac{90}{30}$$
$$\frac{20}{3}\times 2\times \frac{90}{30}$$
$$\frac{20\times 2}{3}\times \frac{90}{30}$$
$$\frac{40}{3}\times \frac{90}{30}$$
$$\frac{40}{3}\times 3$$
$$40$$
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$2^{3}\times 5$
