The weight of 4 elephants is 20 tons, and the weight of 2 blue whales is 320 tons. How many tons does an average blue whale weigh more than an elephant?
4头大象的体重是20吨，2头蓝鲸的体重是320吨．平均一头蓝鲸的体重比一头大象重多少吨？
<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">160 - 5</gadget>
<output>155</output>

<result>155</result>