$$22/7 \times 3.5 \times 3.5$$
$38.5$
$$\frac{22}{7}\times \frac{7}{2}\times 3.5$$
$$\frac{22\times 7}{7\times 2}\times 3.5$$
$$\frac{22}{2}\times 3.5$$
$$11\times 3.5$$
$$38.5$$
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$\frac{7 \cdot 11}{2} = 38\frac{1}{2} = 38.5$
