Mandy has 19 cards. <br> She gives them equally to a few groups of pupils.<br> Each group gets 3 cards. <hr>The greatest possible number of groups of pupils is <input min="0" type="number" id ="imp1pg176q8_1" class="lineinput" placeholder="?" />. <br><input min="0" type="number" id ="imp1pg176q8_2" class="lineinput" placeholder="?" /> card(s) is/are not given out.