The actual coal consumption is 25 tons, which saves 5 tons compared with the plan. How much is the savings compared to the plan? What is the correct formula
实际用煤25t，比计划节约5t，求比计划节约几分之几？算式正确的是多少
<gadget id="calculator">25 + 5</gadget>
<output>30</output>

<gadget id="calculator">5 / 30</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>