A display board is 3 meters long and 15 decimeters wide. Post students' paintings on this exhibition board. The shape of each painting is a square with an area of 9 square decimeters. How many paintings can be pasted at most?
一块展览板长3米，宽15分米．在这块展览板上张贴学生的绘画作品，每幅绘画作品的形状都是面积为9平方分米的正方形，最多可以贴多少幅绘画作品？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">15 / 9</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">30 * (5/3)</gadget>
<output>50</output>

<result>50</result>