A factory saves a total of 8.4 tons of coal in 3 days. According to this calculation, how many tons of coal will be saved in total after working for 5 days?
某厂3天共节约煤8.4吨，照这样计算，再工作5天，共节约煤多少吨？
<gadget id="calculator">8.4 / 3</gadget>
<output>2.8</output>

<gadget id="calculator">2.8 * 5</gadget>
<output>14</output>

<gadget id="calculator">14 + 8.4</gadget>
<output>22.4</output>

<result>22.4</result>