C-13 Fencing Practice Exam 1 Practice

Converting units and rounding up are the key ideas here. A 1.5-mile stretch first becomes feet: 1 mile is 5,280 ft, so 1.5 miles is 7,920 ft. Each roll covers 100 ft, so you need 7,920 ÷ 100 = 79.2 rolls. Since you can’t buy a fraction of a roll, you must round up to the next whole roll, which gives 80 rolls. That’s why the correct amount is 80.