Samuel bought some pies. $$\frac{5}{12}$$ of them were chicken pies and $$\frac{1}{3}$$ of them were mackerel pies. The rest were vegetable pies. <br> He bought 15 more chicken pies than mackerel pies. All the pies were packed in boxes of 4. <hr> How many boxes were needed to pack all the pies? <br> <input min="0" type="number" id ="imp6pg050q7c_1" class="lineinput" placeholder="?" />