A car driving 225 kilometers saves 15 kilograms of gasoline. According to this calculation, how many kilograms of gasoline can be saved in total when driving 720 kilometers? (Solve by two methods of arithmetic and proportion)
一辆汽车行驶225千米节约汽油15千克．照这样计算，行驶720千米，一共节约汽油多少千克？(用算术和比例两种方法解答)
<gadget id="calculator">225 / 15</gadget>
<output>15</output>

<gadget id="calculator">720 / 15</gadget>
<output>48</output>

<result>48</result>