There are 40 boys in Class 6 2. The ratio of boys to girls is 10:9. How many people are there in the class?
六2班有男生40人，男生和女生人数的比是10：9，全班有多少
<gadget id="calculator">10 + 9</gadget>
<output>19</output>

<gadget id="calculator">10 / 19</gadget>
<output>10/19 = around 0.526316</output>

<gadget id="calculator">40 / (10/19)</gadget>
<output>76</output>

<result>76</result>