The school's gymnasium and art building are 80 meters apart. The young pioneers will plant trees on both sides of the path between the two buildings, one tree every 5 meters, how many trees will be planted in total?
学校的体育馆和艺术楼相距80米．少先队员要在两幢楼间的小路两旁栽树，每隔5米植1棵，一共要栽多少棵树？
<gadget id="calculator">80 / 5</gadget>
<output>16</output>

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

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

<result>30</result>