An elephant weighs about 6 tons, and the weight of 4 elephants is equivalent to the weight of 8 cows. How many tons does a cow weigh?
一头大象体重约6吨，4头大象的体重相当于8头牛的体重，一头牛重多少吨．
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

<result>3</result>