A 6-story commercial and residential building is 19 meters high, and the first floor is a street-facing shop with a height of 4.5 meters. How many meters is the average height of each other layer? (solution by equation)
一幢6层的商住楼高为19米，一楼是临街店铺，高为4.5米．其余每层平均高多少米？(用方程解)
<gadget id="calculator">19 - 4.5</gadget>
<output>14.5</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">14.5 / 5</gadget>
<output>2.9</output>

<result>2.9</result>