36 white rabbits. The number of black rabbits is three times that of white rabbits. How many white rabbits and black rabbits are there in total?
白兔36只．黑兔的只数是白兔的3倍，白兔黑兔一共有多少只．
<gadget id="calculator">36 * 3</gadget>
<output>108</output>

<gadget id="calculator">108 + 36</gadget>
<output>144</output>

<result>144</result>