An elephant weighs 4.5 tons and a cow weighs 1.8 tons. How many times does an elephant weigh as much as a cow?
一只大象重4.5吨，一头牛重1.8吨，大象的重量是牛的多少倍？
<gadget id="calculator">4.5 / 1.8</gadget>
<output>2.5</output>

<result>2.5</result>