A hippo weighs 5.1 tons, which is 15 times the weight of a buffalo. How many tons does this hippo weigh more than this buffalo?
一只河马的体重是5.1吨，是一头水牛体重的15倍．这只河马比这头水牛重多少吨？
<gadget id="calculator">5.1 / 15</gadget>
<output>0.34</output>

<gadget id="calculator">5.1 - 0.34</gadget>
<output>4.76</output>

<result>4.76</result>