The company's annual meeting is arranged for the venue. It is planned to use 30 sheets of promotional paper, but the actual saving is (2/5) compared to the plan. How many sheets of paper are actually used? (column equation solution)
公司年会布置会场，计划用宣传纸30张，实际比计划节约了(2/5)，实际用纸多少张？(列方程解答)
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 * (3/5)</gadget>
<output>18</output>

<result>18</result>