After a basket of apples is sold (1/4), 5 kilograms are sold, leaving 16 kilograms. What is the original kilograms of this basket of apples?
一筐苹果卖出(1/4)后，又卖出5千克，还剩16千克，这筐苹果原有多少千克．
<gadget id="calculator">5 + 16</gadget>
<output>21</output>

<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">21 / (3/4)</gadget>
<output>28</output>

<result>28</result>