Use a 90 cm long wooden strip to make a rectangular photo frame, the ratio of length to width is 3:2. What is the area of the picture frame in square centimeters?
用一根90厘米长的木条做成一个长方形相框，长与宽的比为3：2．这个相框的面积是多少平方厘米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">90 * (1/5)</gadget>
<output>18</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">90 * (3/10)</gadget>
<output>27</output>

<gadget id="calculator">18 * 27</gadget>
<output>486</output>

<result>486</result>