Grandma raises 60 rabbits, 25% of which are black rabbits, and the rest are white rabbits. How many white rabbits does grandma raise?
奶奶养了60只兔子，其中有25%是黑兔，其余的都是白兔，奶奶养了多少只白兔？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 * (3/4)</gadget>
<output>45</output>

<result>45</result>