There are 45 white sheep on the grass, and the number of white sheep is more than black sheep (1/4). How many black sheep are there on the grass?
草地上有白羊45只，白羊的只数比黑羊多(1/4)，草地上有多少只黑羊？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">45 / (5/4)</gadget>
<output>36</output>

<result>36</result>