The leather shoe factory produced 25,000 pairs of leather shoes last year. This year, the number of leather shoes produced is twice that of last year. How many pairs were produced in two years?
皮鞋厂去年生产皮鞋25000双，今年生产的皮鞋是去年的2倍，两年共生产多少双？
<gadget id="calculator">25_000 * 2</gadget>
<output>50_000</output>

<gadget id="calculator">25_000 + 50_000</gadget>
<output>75_000</output>

<result>75_000</result>