The tonnage of grain stored in warehouses A and B is equal, and after warehouse A takes out 80 tons and warehouse B takes out 50 tons, the tonnage of grain stored in warehouse B is twice that of warehouse A. How many tons of grain did warehouse A originally store?
甲、乙两仓存粮吨数相等，甲仓取出80吨，乙仓取出50吨后，乙仓存粮的吨数是甲仓的2倍．甲仓原来存粮多少吨？
<gadget id="calculator">80 - 50</gadget>
<output>30</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">30 / 1</gadget>
<output>30</output>

<gadget id="calculator">30 + 80</gadget>
<output>110</output>

<result>110</result>