To find the missing height in the first one you divide 147 by 15 3/4 and get 9 1/3. To find the missing base in the second one you divide 140 5/8 by 11 1/4 and get 12 1/2. To find the missing height in the third one you divide 151 3/16 by 10 1/4 and get 14 3/4.