The weight of a cow is 0.75 tons, and the weight of an elephant is three times the weight of a cow. How many tons do the elephant and the cow weigh together?
一头牛的体重是0.75吨，一头大象的体重是牛的体重的3倍．这头大象和牛的体重一共是多少吨？
<gadget id="calculator">0.75 * 3</gadget>
<output>2.25</output>

<gadget id="calculator">0.75 + 2.25</gadget>
<output>3</output>

<result>3</result>