The two warehouses of A and B each have several tons of grain. After transporting (1/3) from warehouse A to warehouse B, and then transporting (2/5) from warehouse B to warehouse A, B is A's (9/10) ), what fraction of the grain in Warehouse A is that in Warehouse B?
甲乙两个仓库各有粮食若干吨，从甲仓库运出(1/3)到乙仓库后，又从乙仓库运出(2/5)到甲仓库，这时乙是甲的(9/10)，原来甲仓库的粮食是乙仓库的几分之几？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 * (9/10)</gadget>
<output>90</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">90 / (3/5)</gadget>
<output>150</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">40 / (2/3)</gadget>
<output>60</output>

<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<gadget id="calculator">100 + 30</gadget>
<output>130</output>

<gadget id="calculator">60 / 130</gadget>
<output>6/13 = around 0.461538</output>

<result>6/13 = around 0.461538</result>