For a rectangle, the ratio of length to width is 5:4. If the length is increased by 3cm and the width remains the same, the perimeter of this rectangle is 60cm. Find the area of the new rectangle.
一个长方形，长和宽的比是5：4，如果长增加3cm，宽不变，这个长方形的周长是60cm，求新长方形的面积．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">60 - 6</gadget>
<output>54</output>

<gadget id="calculator">54 / 2</gadget>
<output>27</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">27 * (5/9)</gadget>
<output>15</output>

<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">27 * (4/9)</gadget>
<output>12</output>

<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<result>216</result>