I bought some potatoes in the school cafeteria, and I have eaten (1/4), and there are 90 kilograms left. How many kilograms are these potatoes?
学校食堂买来一些土豆，已经吃了(1/4)，还剩90千克，这些土豆有多少千克？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">90 / (3/4)</gadget>
<output>120</output>

<result>120</result>