Mom bought some candy back, Xiaofang ate half of it, and there were 4 yuan left, how many pieces did her mother buy back?
妈妈买回一些糖果，小芳吃了一半，还剩下4块，妈妈买回了多少块．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>