Subtract 30 instead of 29 (which is 1 too many), then add back the extra 1.<br><br>&bull; 47 &minus; 29 = 47 &minus; 30 + 1<br>&bull; 47 &minus; 30 = 17<br>&bull; 17 + 1 = 18<br><br>Final Answer: 30, 17, 18