Helen, Francesca, and Olivia each took a test that had 25 questions. Helen got 20 questions correct, Francesca answered 3 questions incorrectly, and Olivia got 84% of the questions correct. The three unlabeled marks on the double number line below represent the percent and number of the questions each of the three friends answered correctly. Use the double number line to order Helen, Francesca, and Olivia from least to greatest according to the percentage of questions correct.