The number of boys in a class is equal to the number of girls (5/4), and after a girl is transferred, the number of girls is equal to the number of boys (21/25), how many people are there in the class now?
某班男生人数是女生人数的(5/4)，转来1名女生后，这时女生人数是男生人数的(21/25)，现在全班有多少人？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">21 / 25</gadget>
<output>21/25 = around 0.84</output>

<gadget id="calculator">(5/4) * (21/25)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">(21/20) - 1</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">20 * (5/4)</gadget>
<output>25</output>

<gadget id="calculator">20 + 1 + 25</gadget>
<output>46</output>

<result>46</result>