There are 100 rabbit feet, and the number of chicken feet is 60% of the number of rabbit feet. How many chickens and rabbits are there?
兔脚有100只，鸡脚的只数是兔脚只数的60%，鸡兔共多少只．
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">100 * (3/10)</gadget>
<output>30</output>

<gadget id="calculator">25 + 30</gadget>
<output>55</output>

<result>55</result>