People's School builds a new teaching building, the actual cost is 450,000 yuan, which is 10% less than the original plan. How much is the original planned cost? (solution with equation)
人民学校新建一幢教学楼，实际造价45万元，比原计划节约10%，原计划造价是多少万元？(用方程解答)
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">45 / (9/10)</gadget>
<output>50</output>

<result>50</result>