Two warehouses, A and B, store grain: the weight ratio is 8:7. If 1/4 of the stored grain is shipped out from warehouse A, and 8 tons are shipped in from warehouse B, then the grain stored in warehouse B is 15 tons more than warehouse A, and warehouse A How many tons of grain did they store?
甲、乙两个仓库存粮：重量比是8：7，如果从甲仓库运出存粮的(1/4)，乙仓库运进8吨，那么乙仓库的存粮比甲仓库多15吨，甲仓库原来存粮多少吨？
<gadget id="calculator">15 - 8</gadget>
<output>7</output>

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

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(7/8) - 1</gadget>
<output>-1/8 = around -0.125</output>

<gadget id="calculator">(1/4) + (-1/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">7 / (1/8)</gadget>
<output>56</output>

<result>56</result>