Doudou's birthday, father bought a cake, cut it into four pieces on average, Doudou only ate one piece (3/4), how much of the cake did Doudou eat?
豆豆过生日，爸爸买来一个蛋糕，平均切成四块，豆豆只吃了其中一块的(3/4)，豆豆吃了这个蛋糕的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/4) * (3/4)</gadget>
<output>3/16 = around 0.1875</output>

<result>3/16 = around 0.1875</result>