There were $$\frac{3}{5}$$ as many boys as girls in a class. Then, 6 boys and 6 girls joined the class. Now, there are $$\frac{3}{4}$$ as many boys as girls in the class. <hr> There were <input min="0" type="number" id ="imp5pg065q7_1" class="lineinput" placeholder="?" /> pupils in the class at first.