If the length of a rectangle is reduced by 1.5 meters or the width is reduced by 1.2 meters, its area will be reduced by 6 square meters. What is the area of this rectangle?
一个长方形的长减少1.5米，或宽减少1.2米，那么它的面积就都减少6平方米，这个长方形的面积是多少．
<gadget id="calculator">6 / 1.2</gadget>
<output>5</output>

<gadget id="calculator">6 / 1.5</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>