Mom gave Xiaolong all the pocket money for 10 days. Xiaolong took (1/2) of the total on the first day, took the rest (1/3) on the second day, and took the rest (1/3) on the third day 4) After 10 days, Xiaolong still has 4 yuan left. How much money will his mother give Xiaolong?
妈妈把小龙10天的零花钱都给了他，小龙第1天拿走总数的(1/2)，第2天拿走余下的(1/3)，第3天拿走余下的(1/4)…10天后，小龙还剩4元钱，妈妈给小龙多少钱？
<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">4 / (1/11)</gadget>
<output>44</output>

<result>44</result>