$$\frac{g}{2}:\frac{9g}{2}:\frac{25g}{2}$$
$\frac{2}{225g}$
$$\frac{\frac{g}{2}\times 2}{\frac{9g}{2}\times 25g}$$
$$\frac{g}{\frac{9g}{2}\times 25g}$$
$$\frac{g}{\frac{9g\times 25}{2}g}$$
$$\frac{g}{\frac{9g\times 25g}{2}}$$
$$\frac{g\times 2}{9g\times 25g}$$
$$\frac{2}{9\times 25g}$$
$$\frac{2}{225g}$$
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$-\frac{2}{225g^{2}}$
