48 students are arranged in 3 rows, the distance between the two students before and after is 1 meter, how long is the line
48名同学排3列，前后两个同学之间的距离是1米，这个队伍长多少
<gadget id="calculator">48 / 3</gadget>
<output>16</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">15 * 1</gadget>
<output>15</output>

<result>15</result>