There are two warehouses, A and B. If 1/5 of B's grain storage is transported to A's grain warehouse, then the two grain warehouses will have the same amount of grain. It is known that A grain warehouse originally stored 90 tons of grain, how many tons of grain B originally stored?
有甲、乙两个仓库，如果将乙库存粮的(1/5)运到甲粮库，那么两个粮库的存粮就同样多．已知甲粮库原来存粮90吨，乙粮仓原来存粮多少吨？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 2</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 / (3/5)</gadget>
<output>150</output>

<result>150</result>