There are 180 sheep grazing on the grass, 25% of them are goats, and the rest are sheep. How many sheep are there?
草地上有180只羊在吃草，其中25%是山羊，其余的都是绵羊，绵羊有多少只？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">180 * (3/4)</gadget>
<output>135</output>

<result>135</result>