$$1/2 \times 18.73 \times 15$$
$140.475$
$$\frac{1}{2}\times \frac{1873}{100}\times 15$$
$$\frac{1\times 1873}{2\times 100}\times 15$$
$$\frac{1873}{200}\times 15$$
$$\frac{1873\times 15}{200}$$
$$\frac{28095}{200}$$
$$\frac{5619}{40}$$
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$\frac{3 \cdot 1873}{5 \cdot 2 ^ {3}} = 140\frac{19}{40} = 140.475$
