Use a piece of wire to form a right triangle. The ratio of the lengths of the three sides is 3:4:5. It is known that the length of the hypotenuse is 15 meters. How many meters is the length of this piece of wire?
用一段铁丝围成一个直三角形，三条边长度的比是3：4：5，已知斜边长15米，这段铁丝长多少米？
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 + 5 + 4</gadget>
<output>12</output>

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<result>36</result>