The number of goats is 2/3 of that of sheep. There are 30 more sheep than goats. How many goats are there?
山羊的只数是绵羊的(2/3)，绵羊比山羊多30只，山羊有多少只．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 / (1/3)</gadget>
<output>90</output>

<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<result>60</result>