The driver, Uncle Wang, fills up 30 liters of fuel at the gas station and goes to work at a company 160 kilometers away from the gas station. Calculated by the fact that each liter of gasoline can drive 8 kilometers, how many liters of gasoline do you need to add when you come back?
司机王叔叔在加油站加了30升油后，去距离加油站160千米的公司去办事，按每升汽油可行驶8千米计算，回来还需要加多少升汽油？
<gadget id="calculator">160 * 2</gadget>
<output>320</output>

<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<gadget id="calculator">320 - 240</gadget>
<output>80</output>

<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<result>10</result>