To expand a factory building, the actual investment is 280,000 yuan, which is the planned investment (7/9). How much was the original planned investment? (solution by equation)
扩建一座厂房，实际投资28万元，是计划投资的(7/9)，原计划投资多少万元？(用方程解)
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">28 / (7/9)</gadget>
<output>36</output>

<result>36</result>