$$\frac{8}{5}\times\frac{20}{16}\times\frac{15}{2}=$$
$15$
$$\frac{8}{5}\times \frac{5}{4}\times \frac{15}{2}$$
$$\frac{8\times 5}{5\times 4}\times \frac{15}{2}$$
$$\frac{8}{4}\times \frac{15}{2}$$
$$2\times \frac{15}{2}$$
$$15$$
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$3\times 5$
