Engineer Li designed a rectangular flower garden with a width of 15 meters for the Civic Square. Later, he increased the width of the flower garden by 8 meters, so the area of the flower garden increased by 240 square meters. What is the current size of the garden?
李工程师为市民广场设计了一个宽是15米的长方形花圃，后来他又将这个花圃的宽增加了8米，于是这个花圃的面积增加了240平方米．现在这个花圃的面积是多少？
<gadget id="calculator">240 / 8</gadget>
<output>30</output>

<gadget id="calculator">15 + 8</gadget>
<output>23</output>

<gadget id="calculator">30 * 23</gadget>
<output>690</output>

<result>690</result>