The grain in warehouse A is 60 kg, which is 20 kg less than twice the grain in warehouse B. How many kilograms of grain is stored in warehouse B?
甲仓存粮60千克，比乙仓存粮的2倍少20千克．乙仓存粮多少千克？
<gadget id="calculator">20 + 60</gadget>
<output>80</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<result>40</result>