A car saves 109.8 liters of gasoline in 30 days. According to this calculation, how many liters of gasoline can this car save in a week?
一辆汽车30天节约汽油109.8升，照这样计算，这辆汽车一周可以节约多少升汽油？
<gadget id="calculator">109.8 / 30</gadget>
<output>3.66</output>

<gadget id="calculator">3.66 * 7</gadget>
<output>25.62</output>

<result>25.62</result>