Use four wooden strips to form a parallelogram with a base of 15cm and a height of 8cm. After drawing it into a rectangle, the area increases by 30cm**2. What is the perimeter of the original parallelogram?
用四根木条订成一个底是15cm，高是8cm的平行四边形，把它拉成一个长方形后，面积增加了30cm**2．则原来平行四边形的周长是多少．
<gadget id="calculator">30 / 15</gadget>
<output>2</output>

<gadget id="calculator">2 + 8 + 15</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>