The yardstick is three feet long. The 75-inch rope is about 6 feet long (6 ft = 72 in). The 1.21-m chain is about 20% more than 40 inches (really 39.37 inches), or about 48 inches, which is 4 feet. Thus the sequence of lengths is yardstick (3 0, rattlesnake (3.5 ft), chain (4 ft), and rope (6 ft).
If the total capacity of the basket is 24 to find 1/6 you divide 24 by 6 and get 4. 4 is equal to 1/6 of 24 which means Sandra can only bring 4 bananas.