180 children lined up in two teams on average for the spring outing. Xiao Gang and Xiao Ming are in the same team. Counting from the top to the back, Xiao Gang said the 49th, and counting from the end to the front, Xiao Ming said the 58th, do you know how many people are there between Xiao Gang and Xiao Ming?
180个小朋友平均排成两队去春游．小刚和小明在一个队里．从排头往后数，小刚说第49个，从排尾往前数，小明说第58个，你知道小刚和小明中间有几个人？
<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">58 - 90 - 2</gadget>
<output>-34</output>

<gadget id="calculator">49 + (-34)</gadget>
<output>15</output>

<result>15</result>