There are three warehouses of grain, and warehouse A accounts for 25% of the total weight. If 4 tons of grain are shipped from warehouse B to warehouse A, then the number of tons of grain stored in the three warehouses is equal. How many tons of grain did the three warehouses coexist?
有三仓粮食，甲仓占总重量的25%．如果从乙仓运出4吨粮食给甲仓，则三仓存粮吨数相等．原来三仓共存粮多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">4 / (1/12)</gadget>
<output>48</output>

<result>48</result>