A rectangle has a width of 5 centimeters. If the width is increased by 4 centimeters, the area will increase by 56 square centimeters. What is the area of the original rectangle?
一个长方形，宽是5厘米，如果宽增加4厘米，面积就增加56平方厘米，原来长方形的面积是多少？
<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<gadget id="calculator">14 * 5</gadget>
<output>70</output>

<result>70</result>