A car saves 20 kilograms of fuel in 4 days. According to this calculation, how many kilograms of gasoline can be saved in a week?
一辆汽车4天共节约油20千克，照这样计算，一周可节约汽油多少千克？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>