The length of a classroom is 3.5cm and the width is 3cm measured on the floor plan with a scale of (1/200). What is the floor area of this classroom in m**2.
在比例尺是(1/200)的平面图上量得一间教室的长是3.5cm，宽是3cm，这间教室的地面面积是多少m**2．
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">3.5 / (1/200) / 100</gadget>
<output>7</output>

<gadget id="calculator">3 / (1/200) / 100</gadget>
<output>6</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<result>42</result>