Solve the equation: (3/5): x=(1/5): 0.75.
解方程：(3/5)：x=(1/5)：0.75．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 0.75</gadget>
<output>0.45</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">0.45 / (1/5)</gadget>
<output>2.25</output>

<result>2.25</result>