$$25 \times 16 \div (60 \div 15)-4 \times (77-62) \div (20 \times 6 \div 3)$$
$\frac{197}{2}=98.5$
$$\frac{400}{\frac{60}{15}}-\frac{4\left(77-62\right)}{\frac{20\times 6}{3}}$$
$$\frac{400}{4}-\frac{4\left(77-62\right)}{\frac{20\times 6}{3}}$$
$$100-\frac{4\left(77-62\right)}{\frac{20\times 6}{3}}$$
$$100-\frac{4\times 15}{\frac{20\times 6}{3}}$$
$$100-\frac{60}{\frac{20\times 6}{3}}$$
$$100-\frac{60}{\frac{120}{3}}$$
$$100-\frac{60}{40}$$
$$100-\frac{3}{2}$$
$$\frac{200}{2}-\frac{3}{2}$$
$$\frac{200-3}{2}$$
$$\frac{197}{2}$$
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$\frac{197}{2} = 98\frac{1}{2} = 98.5$
