Considering a cake as a whole 1, Xiao Ming and his mother ate (1/3) of this cake. Now Xiao Ming wants to divide the remaining cake into 5 parts on average, take 4 parts of it to school and share it with his four good friends, and leave the rest for his father. The cake that Xiao Ming brings to school is the whole cake. How many.
将一个蛋糕看成整体1，小明和妈妈吃了这块蛋糕的(1/3)．现小明想把余下的蛋糕平均分成5份，取其中的4份带到学校分给他的四个好朋友吃，剩下的留给他爸爸吃，小明带到学校去的蛋糕是整个蛋糕的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) / 5</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">4 * (2/15)</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>