Multiple choice Which one of the following is not correctly match? 4 Imperial gallons = 18.18 litres 4 pounds = 1.81 kilograms 30 pounds per sq. in. = 2.07 kg per sq. cm. 5 hectares = 18.35 acres Reveal answer Fill a bubble to check yourself D Correct answer Explanation 5 hectares is equal to approximately 12.35 acres, not 18.35 acres. The other conversions provided are standard approximations.