Xiaoqiang's family bought a bag of flour, and after eating (3/4), there were still 20 kilograms left. How many kilograms is this bag of flour in total? (answer in two ways)
小强家买了一袋面粉，吃了(3/4)后还剩下20千克．这袋面粉一共有多少千克？(用两种方法解答)
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / (1/4)</gadget>
<output>80</output>

<result>80</result>