There are 20 tons of steel in the warehouse, 25% of the total is used for the first time, and (1/2) ton is used for the second time. How many tons are shared between the two times?
仓库里有20吨钢材，第一次用去总数的25%，第二次用去(1/2)吨，两次共用去多少吨．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 * (1/4)</gadget>
<output>5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 + (1/2)</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>