After granary A shipped 60 tons of flour to granary B, the flour stored in granary B was still 20 tons less than granary A. Now granary B stores 100 tons of flour, how many tons of flour is stored in granary A?
甲粮仓运出60吨面粉给乙粮仓后，这时乙粮仓存放的面粉还比甲粮仓少20吨．现在乙粮仓存放了100吨面粉，求原来甲粮仓存放了多少吨面粉？
<gadget id="calculator">100 + 20 + 60</gadget>
<output>180</output>

<result>180</result>