The students are in physical education class. There are 10 boys lined up in a row, and the two adjacent boys are 1 meter apart. How many meters is the length of this row of boys?
同学们上体育课，有10个男生排成一排，相临两个男生相隔1米．问这排男生排列的长度有多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1 * 9</gadget>
<output>9</output>

<result>9</result>