$$\frac{18}{25}\div\frac{9}{5}\times\frac{15}{4}$$
$\frac{3}{2}=1.5$
$$\frac{18}{25}\times \frac{5}{9}\times \frac{15}{4}$$
$$\frac{18\times 5}{25\times 9}\times \frac{15}{4}$$
$$\frac{90}{225}\times \frac{15}{4}$$
$$\frac{2}{5}\times \frac{15}{4}$$
$$\frac{2\times 15}{5\times 4}$$
$$\frac{30}{20}$$
$$\frac{3}{2}$$
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$\frac{3}{2} = 1\frac{1}{2} = 1.5$