In the sixth grade, the ratio of male to female was 4:3. Later, 2 girls were transferred. Now the ratio of male to female is 5:4. How many students were there in the sixth grade?
六年级原来男女人数的比是4：3，后来又转来2名女生，现在男女人数的比是5：4，原来六年级有多少人？
<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">2 / (1/20)</gadget>
<output>40</output>

<gadget id="calculator">40 * (4/5)</gadget>
<output>32</output>

<gadget id="calculator">40 + 32</gadget>
<output>72</output>

<gadget id="calculator">72 - 2</gadget>
<output>70</output>

<result>70</result>