The number of white rabbits is 25% less than that of black rabbits, and there are 20 more black rabbits than white rabbits. How many white rabbits are there? (solution by equation)
白兔只数比黑兔少25%，黑兔比白兔多20只，白兔有多少只？(用方程解)
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / (1/4)</gadget>
<output>80</output>

<gadget id="calculator">80 - 20</gadget>
<output>60</output>

<result>60</result>