Xiaoming’s father’s car used to have 16.5 liters of gasoline, but 9.8 liters were used up, and another 15.8 liters were added. How many liters of gasoline are in the car’s fuel tank now?
小明爸爸的小汽车原有16.5升汽油，用去9.8升，又加了15.8升，现在小汽车的油箱里有多少升汽油？
<gadget id="calculator">16.5 - 9.8</gadget>
<output>6.7</output>

<gadget id="calculator">6.7 + 15.8</gadget>
<output>22.5</output>

<result>22.5</result>