Xiaohua miscalculated 4*(□+5) as 4*□+5, how far is the result she got from the correct answer
小华把4*(□+5)错算成4*□+5，她得到的结果与正确答案相差多少
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>