In a basket of apples, students in Class 6 and 2 ate (1/4) 4 kg less for the first time, and (2/5) 3 kg more after eating the second time, leaving 12 kg. How much is the original basket of apples?
一筐苹果，六2班同学第一次吃了(1/4)少4千克，第二次吃了余下了(2/5)多3千克，还剩12千克，原来一筐苹果多少千克？
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<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>

<gadget id="calculator">25 - 4</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>