The grain stored in Warehouse A is 31 tons, which is 1 ton less than the 4 times of the grain stored in Warehouse B. How many tons of grain is stored in warehouse B?
甲仓存粮31吨，比乙仓存粮吨数的4倍少1吨．乙仓存粮多少吨？
<gadget id="calculator">31 + 1</gadget>
<output>32</output>

<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<result>8</result>