In a 20-storey building, the first floor is 3.5 meters high, and the other floors are 3.2 meters high. How many meters high is this building?
一座高20层的楼房，第一层高3.5米，其余每层高3.2米，这座楼房高多少米？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">3.2 * 19</gadget>
<output>60.8</output>

<gadget id="calculator">3.5 + 60.8</gadget>
<output>64.3</output>

<result>64.3</result>