$$A = \frac { g } { 10 } \div \frac { 10 } { 11 } \div \frac { 11 } { 12 }$$
$g=\frac{25A}{3}$
$$\frac{\frac{\frac{g}{10}}{\frac{10}{11}}}{\frac{11}{12}}=A$$
$$\frac{g}{\frac{10}{11}\times \frac{11}{12}\times 10}=A$$
$$\frac{g}{\frac{5}{6}\times 10}=A$$
$$\frac{g}{\frac{25}{3}}=A$$
$$\frac{3}{25}g=A$$
$$\frac{\frac{3}{25}g}{\frac{3}{25}}=\frac{A}{\frac{3}{25}}$$
$$g=\frac{A}{\frac{3}{25}}$$
$$g=\frac{25A}{3}$$
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$A=\frac{3g}{25}$
