There are 15 goats, and the number of sheep is three times that of goats. How many goats and sheep are there altogether?
山羊有15只，绵羊的只数是山羊的3倍，山羊和绵羊一共有多少只．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

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

<result>60</result>