The number of buffaloes on the grass is 3/5 of the total number of cattle, and the rest are scalpers. There are 30 in total. How many buffaloes and scalpers are there?
草地上水牛的头数是总牛数的(3/5)，剩下的是黄牛，共有30头，水牛与黄牛共有多少头？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<result>75</result>