The number of goats is 45 more than that of sheep, and the number of goats is 4 times that of sheep. How many goats are there?
山羊的只数比绵羊多45只，山羊的只数是绵羊的4倍，山羊有多少只．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>