The fruit store shipped 20 tons of fruit for the first time, and twice as much fruit for the second time. How many tons were shipped in total?
水果店第一次运来水果20吨，第二次运来的水果是第一次的2倍，两次共运多少吨．
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 + 20</gadget>
<output>60</output>

<result>60</result>