At the beginning of the term, the school organized an autumn outing. Before going out in the morning, Xiaohong asked her mother for some pocket money. During the autumn outing, Xiaohong used (2/3) of her pocket money to buy a few small gifts she liked, and used (2/3) of the remaining money to buy drinks. When she returned home, she had 4 yuan left. How much pocket money did Xiaohong ask her mother?
开学初，学校组织秋游．早上临出门时，小红向妈妈要了一些零用钱．秋游过程中，小红用(2/3)的零用钱买了几样自己喜欢的小礼品，又用余下的钱的(2/3)买了饮料，回家时还剩4元钱．小红向妈妈要了多少零用钱？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * (2/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/3) - (2/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">4 / (1/9)</gadget>
<output>36</output>

<result>36</result>