The number of boys in the reading room is 3/4 of the number of girls. After a new boy arrives, the number of boys accounts for 4/9 of the total number. How many people are there in the reading room now?
图书阅览室里男生人数是女生人数的(3/4)，又新来一名男生后，这时男生人数占总人数的(4/9)，现在阅览室里有多少人？
<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / (1/20)</gadget>
<output>20</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<gadget id="calculator">15 + 20 + 1</gadget>
<output>36</output>

<result>36</result>