The length and width of a rectangle are 7 meters and 5 meters respectively, if its length and width are increased by 3 meters, how much will the area increase?
一个长方形的长和宽分别是7米和5米，如果将它的长和宽各增加3米，那么面积增加多少？
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">80 - 35</gadget>
<output>45</output>

<result>45</result>