The original number of boys in the sixth grade was girls (3/4), and then 3 boys were transferred, and now the number of boys is the number of girls (4/5). How many boys are there now?
六年级原来的男生人数是女生的(3/4)，后来又转来3名男生，现在男生人数是女生人数的(4/5)．现在有男生多少人？
<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">3 / (1/20)</gadget>
<output>60</output>

<gadget id="calculator">60 * (4/5)</gadget>
<output>48</output>

<result>48</result>