0What is the Highest Common Factor of 21.97, 15.21, 16.9, 18.59 and 20.28?A1.3B1.69C13D3 Correct answer: B ExplanationWrite the numbers as 2197, 1521, 1690, 1859 and 2028 (×1/100). Their HCF is 169, so the HCF of the given numbers is 169/100 = 1.69. Join the discussion Report an error Share