On Ching Ming Festival, Uncle Li drove back to his hometown 280 kilometers away. When driving 20 kilometers, Uncle Li found that 2 liters of gasoline had been used. According to this calculation, do you know how many liters of gasoline are needed to drive the whole journey?
清明节，李叔叔开车回相距280千米的老家．行驶20千米时，李叔叔发现已经用去2升汽油．照这样计算，你知道行驶完全程还需要多少升汽油？
<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">280 - 20</gadget>
<output>260</output>

<gadget id="calculator">(1/10) * 260</gadget>
<output>26</output>

<result>26</result>