Two warehouses, A and B, have a total of 150 tons of grain. The grain in warehouse A is 4 times that of warehouse B. How many tons more is warehouse A than warehouse B?
甲乙两个仓库共有粮食150吨，甲仓的粮食是乙仓的4倍，甲仓比乙仓多多少吨？
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">150 / 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">120 - 30</gadget>
<output>90</output>

<result>90</result>