There are 28 black swans, and the number of white swans is three times that of black swans. How many swans are there altogether?
黑天鹅有28只，白天鹅的只数是黑天鹅的3倍．一共有多少只天鹅？
<gadget id="calculator">28 * 3</gadget>
<output>84</output>

<gadget id="calculator">84 + 28</gadget>
<output>112</output>

<result>112</result>