There are 60 white rabbits, 20% more than black rabbits. How many black rabbits are there? What is the column
白兔有60只，比黑兔多20%，黑兔有多少只？列式是多少
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">60 / (6/5)</gadget>
<output>50</output>

<result>50</result>