A right triangle is surrounded by a wire 60 cm long. Given that the ratio of the three sides of a triangle is 3:4:5, what is the area of the triangle in cm**2.
用一根长60cm的铁丝围一个直角三角形．已知三角形三条边的比是3：4：5，那么这个三角形的面积是多少cm**2．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 * (1/4)</gadget>
<output>15</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">60 * (1/3)</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>