There are two piles of apples, the second pile is the first pile (9/10), and they are all distributed to A, B, and C. A gets (2/5), and the ratio of B and C’s apples is 7:5. If Take out 20 kilograms from the first pile and put them into the second pile. The two piles are equal, and A is divided into several kilograms more than B.
两堆苹果，第二堆是第一堆的(9/10)，都分给甲乙丙三人，甲分到(2/5)，乙与丙分到的苹果之比是7：5，若第一堆取出20千克放入第二堆两堆就相等，甲比乙多分到几千克．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / (1/10)</gadget>
<output>20</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">400 - 40</gadget>
<output>360</output>

<gadget id="calculator">360 + 400</gadget>
<output>760</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">760 * (2/5)</gadget>
<output>304</output>

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

<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(3/5) * (7/12)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">760 * (7/20)</gadget>
<output>266</output>

<gadget id="calculator">304 - 266</gadget>
<output>38</output>

<result>38</result>