The original grain weight ratio between A and B grain depots is 4:3. When A grain depot supplies B with 108 tons of grain, the grain weight ratio between A and B grain depots is 3:4. How many tons of grain does A storehouse have?
甲、乙两个粮库原有粮食重量比是4：3，当甲粮库给乙粮库108吨粮食后甲、乙两粮库粮食重量的比是3：4．原来甲粮库有粮食多少吨？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">108 / (1/7)</gadget>
<output>756</output>

<gadget id="calculator">756 * (4/7)</gadget>
<output>432</output>

<result>432</result>