answer:Since the mean and median are both 4, the three numbers must be 1, 4, and 7. The range of the set is the difference between the largest and smallest numbers, which is 7-1=boxed{6}. The answer is: 6

answer:If Melina's age is 60 and she is three times as old as Alma, then Alma's age is 60/3 = 20. The sum of their ages is 60+20 = 80. If the sum of their ages is twice the total number of points Alma scored in a test, then Alma's score in the test is 80/2 = 40. 40 The answer is: 40

answer:If Bob paid 6000 for his acorns and Alice purchased 3600 acorns for nine times the price Bob paid, then Alice paid 9*6000 = 54000 for her acorns. To find out how much Alice paid for each acorn, we divide the total amount Alice paid by the number of acorns she purchased: 54000 / 3600 = 15 Therefore, Alice paid 15 for each acorn. 15 The answer is: 15

answer:To find one third of 5.4, we divide 5.4 by 3. This gives us frac{5.4}{3} = frac{54}{10} div frac{3}{1} = frac{54}{10} cdot frac{1}{3} = frac{54}{30} = frac{9}{5}. Therefore, one third of 5.4 is boxed{frac{9}{5}}.The answer is: frac{9}{5}