The numbers on each side of the square add up to 15. <br>What are the numbers A, B and C? <hr> A: <input min="0" type="number" id ="imp1pg213q9_1" class="lineinput" placeholder="?" /><br> B: <input min="0" type="number" id ="imp1pg213q9_2" class="lineinput" placeholder="?" /> <br>C: <input min="0" type="number" id ="imp1pg213q9_3" class="lineinput" placeholder="?" />