The ratio of the number of boys and girls in Class 1, Class 6 of Hongxing Primary School is 4:3. It is known that there are 12 girls. How many people are there in the class?
红星小学六1班男女生人数的比是4：3，已知女生有12人，全班有多少人？
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<result>28</result>