Chunhua wants to buy some Christmas cards. Since the price of Christmas cards is reduced by 20%, she can buy 6 more with the same amount of money. How many Christmas cards did Chunhua want to buy?
春华要买一些圣诞卡，由于圣诞卡减价20%，用同样多的钱她可以多买6张．问春华原来要买多少张圣诞卡？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / (1/5)</gadget>
<output>4</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>