There are 180 sheep grazing on the grassland, among which (2/3) are goats, and the rest are sheep. How many sheep are there?
草地上有180只羊在吃草，其中(2/3)是山羊，其余的都是绵羊．绵羊有多少只？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">180 * (2/3)</gadget>
<output>120</output>

<gadget id="calculator">180 - 120</gadget>
<output>60</output>

<result>60</result>