Xiaowei raised 15 white rabbits and 30 black rabbits. The number of white rabbits raised accounts for ((())/(())) of the total number of rabbits.
小伟同学养白兔15只，黑兔30只．养白兔的只数占兔子总数的((())/(()))．
<gadget id="calculator">15 + 30</gadget>
<output>45</output>

<gadget id="calculator">15 / 45</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>