There are two warehouses, A and B. If 15 tons of grain are shipped from warehouse A and put into warehouse B, then the grain in warehouse B is (5/7) that of warehouse A. It is known that warehouse B’s original grain is 35 tons, and warehouse A’s original grain How many tons?
甲乙两个仓库，如果从甲仓库运出15吨粮食放入乙仓库，这时乙仓库的粮食是甲仓库的(5/7)，已知乙仓库原有粮食35吨，甲仓库原有粮食多少吨？
<gadget id="calculator">35 + 15</gadget>
<output>50</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">50 / (5/7)</gadget>
<output>70</output>

<gadget id="calculator">70 + 15</gadget>
<output>85</output>

<result>85</result>