Xiaohong's family bought a bag of rice, ate it (2/5), and left 15 kilograms. How many kilograms of rice did you buy?
小红家买了一袋大米，吃了(2/5)，还剩15千克．买来大米多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 / (3/5)</gadget>
<output>25</output>

<result>25</result>