20% discount on all products in the sporting goods store. Teacher Twin bought a soccer ball with an original price of 125 yuan. If you use the money to buy badmintons with an original price of 5 yuan, how many can you buy?
体育用品店所有商品一律八折优惠．孪老师买了一个原价是125元的足球，如果用这些钱购买原价是5元一个的羽毛球，可以买多少个？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) / 4</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">125 * (1/5)</gadget>
<output>25</output>

<result>25</result>