A class of 62 people is arranged in two columns, and the distance between the front and back of each column is 50 cm, so how many meters is the length from the head to the end of the row?
某班62人，排成两个纵队，每纵队前后两人之间距离50厘米，那么从排头到排尾长多少米．
<gadget id="calculator">62 / 2</gadget>
<output>31</output>

<gadget id="calculator">31 - 1</gadget>
<output>30</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<result>15</result>