$$.75 c m : 1 m 25 c m z 10 : 27.50$$
$\frac{3m_{25}z_{10}\left(cm\right)^{2}}{110}$
$$\frac{0.75cmm_{25}cmz_{10}}{27.5}$$
$$\frac{0.75c^{2}mm_{25}mz_{10}}{27.5}$$
$$\frac{0.75c^{2}m^{2}m_{25}z_{10}}{27.5}$$
$$\frac{3}{110}c^{2}m^{2}m_{25}z_{10}$$
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$\frac{3z_{10}\left(cm\right)^{2}}{110}$
