When doing a series of additions on a calculator, a student accidentally adds 615 to 651 by mistake, how much should she subtract now in order to get the correct result the first time in the next step
当在计算器上做一系列加法时，一位学生不小心将加615错加成651，为了在下一步中一次得到正确的结果，她现在应当减多少
<gadget id="calculator">651 - 615</gadget>
<output>36</output>

<result>36</result>