There are 15 geese in the pond, and the number of ducks is three times that of geese. How many ducks and geese are there altogether?
池塘里有鹅15只，鸭的只数是鹅的3倍，鸭和鹅一共有多少只．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">45 + 15</gadget>
<output>60</output>

<result>60</result>