Xiao Ming wants to buy a pencil. Since the price of the pencil is reduced by 20%, he can buy 6 more pencils for the same money. How many pencils did Xiao Ming plan to buy?
小明要买一支铅笔，由于铅笔减价20%，同样的钱他可以多买6支，问小明原计划买多少支铅笔？
<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>