21.
5.25 x 4 = 21 inches Goran needs.
11 x 21 = 231 inches Natalie needs.
65.5 x 4 = 262 inches of total wood they have.
23 + 231 = 254 inches of wood used by both Goran and Natalie
262 - 254 = 8 inches of wood left over.
So the answer for this would be D because 8 inches is not an answer given.
22.
6 x 12.6 = 75.6 total ounces of beans.
75.6 x .7 = 52.92 ounces of beans used in the stew.
75.6 - 52.92 = 22.68 ounces, so the answer for this would be D.
Good Luck!