There is a rectangular lawn with a length of 15 meters and a width of 8 meters next to the pistachio orchard. If its length is increased by 5 meters and its width is increased by 2 meters, how many meters will the lawn area increase?
开心果园旁边有一块长15米，宽8米的长方形草坪，如果将它的长增加5米，宽增加2米，草坪面积会增加多少米？
<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">200 - 120</gadget>
<output>80</output>

<result>80</result>