Grandpa walked twice along the rectangular square with a length of 50 meters and a width of 25 meters. How many meters did he walk?
爷爷沿着长50米，宽25米的长方形广场走了两圈，走了多少米
<gadget id="calculator">50 + 25</gadget>
<output>75</output>

<gadget id="calculator">75 * 2 * 2</gadget>
<output>300</output>

<result>300</result>