Xiaojuan bought a novel with half of the money she saved, and then her mother gave her another 5 yuan, and she bought a dictionary with more than half of the 0.4 yuan, and the result was 5.2 yuan left, so how much did Xiaojuan save? money.
小娟用自己存的钱的一半买了一本小说，后来妈妈又给她5元，她又用其中的一半多0.4元买了字典，结果还剩5.2元，那么小娟原来存了多少元钱．
<gadget id="calculator">5.2 + 0.4</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 * 2</gadget>
<output>11.2</output>

<gadget id="calculator">11.2 - 5</gadget>
<output>6.2</output>

<gadget id="calculator">6.2 * 2</gadget>
<output>12.4</output>

<result>12.4</result>