An elephant weighs 6 tons, exactly 15 times the weight of a cow. How much does a cow weigh in tons?
一只大象的体重是6吨，正好是一头牛体重的15倍．一头牛的体重是多少吨？
<gadget id="calculator">6 / 15</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>