$$\frac{ 1 }{ 2 } \times \frac{ 25 }{ 2 } +7 \times \frac{ 25 }{ 2 } -6$$
$\frac{351}{4}=87.75$
$$\frac{1\times 25}{2\times 2}+7\times \frac{25}{2}-6$$
$$\frac{25}{4}+7\times \frac{25}{2}-6$$
$$\frac{25}{4}+\frac{7\times 25}{2}-6$$
$$\frac{25}{4}+\frac{175}{2}-6$$
$$\frac{25}{4}+\frac{350}{4}-6$$
$$\frac{25+350}{4}-6$$
$$\frac{375}{4}-6$$
$$\frac{375}{4}-\frac{24}{4}$$
$$\frac{375-24}{4}$$
$$\frac{351}{4}$$
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$\frac{3 ^ {3} \cdot 13}{2 ^ {2}} = 87\frac{3}{4} = 87.75$
