Xiaohua divides her books into 4 shares on average, and gives one of them to her younger sister. This share is equivalent to twice the original books of her younger sister. What fraction of Xiaohua's book is her sister's now?
小华把自己的图书平均分成4份，把其中的一份送给了妹妹，这一份相当于妹妹原来图书的2倍，现在妹妹的图书相当于小华的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 2</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) + (1/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) / 1</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>