For a trapezoid, if the upper base is extended by 5 cm, the area increases by 25 cm2 and becomes a parallelogram. It is known that the lower base of the original trapezoid is 7 cm, what is the area of the parallelogram after the increase in square centimeters?
一个梯形，若上底延长5厘米，面积就增加25平方厘米，并且变成了一个平行四边形．已知原梯形的下底是7厘米，增加后平行四边形的面积是多少平方厘米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 * (2/5)</gadget>
<output>10</output>

<gadget id="calculator">7 * 10</gadget>
<output>70</output>

<result>70</result>