The highest price of tickets for the opening ceremony of the London Olympic Games is 21,000 yuan, which is 1/20 more expensive than the highest price of tickets for the closing ceremony. How much is the highest price of tickets for the opening ceremony?
伦敦奥运会开幕式门票的最高价是21000元，比闭幕式门票的最高价贵(1/20)，幕式门票的最高价是多少元？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">21_000 / (21/20)</gadget>
<output>20_000</output>

<result>20_000</result>