A factory consumes 80 tons of coal in September and 70 tons of coal in October. How much is the coal saved in October compared with September?
某工厂九月份用煤80吨，十月份用煤70吨，十月份比九月份节约用煤多少．
<gadget id="calculator">80 - 70</gadget>
<output>10</output>

<gadget id="calculator">10 / 80</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>