The canteen used 21 tons of coal in July, saving 3 tons compared with June. How much is the savings in July compared to June?
食堂七月份用煤21吨，比六月份节约3吨．七月份比六月份节约百分之几？
<gadget id="calculator">21 + 3</gadget>
<output>24</output>

<gadget id="calculator">3 / 24</gadget>
<output>1/8 = around 0.125</output>

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