There are 300 roses in the flower bed, among which the number of red roses accounts for (3/4), the number of red roses accounts for (9/2) of the number of yellow roses, how many yellow roses are there in the flower bed?
花坛里有300株玫瑰花，其中红玫瑰的株数占(3/4)，红玫瑰的株数占黄玫瑰的(9/2)，花坛里有黄玫瑰多少株？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(3/4) / (9/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">300 * (1/6)</gadget>
<output>50</output>

<result>50</result>