A teaching building, the actual investment is 2.5 million yuan, saving (1/6) compared with the plan. How much do you plan to invest? (Use equations first and then use arithmetic methods to solve)
座教学楼，实际投资250万元，比计划节约(1/6)．计划投资多少万元？(先用方程再用算术方法解答)
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">250 / (5/6)</gadget>
<output>300</output>

<result>300</result>