The pie chart shows the number of items sold at a school bookshop. <hr> What is the ratio of number of files sold to number of exercise books sold? <br> <input min="0" type="number" id="imp6pg172q8b_1" class="lineinput" placeholder="?"> : <input min="0" type="number" id="imp6pg172q8b_2" class="lineinput" placeholder="?">