Arrange the following ratios in descending order. 2 : 5, 3 : 8, 5 : 6, 4 : 7
5 : 6 > 4 : 7 > 2 : 5 > 3 : 8
Each ratio can be converted into a decimal value to make comparison easier: 2/5 = 0.4, 3/8 = 0.375, 5/6 = 0.833, and 4/7 = 0.571.
Arranging these decimal values in descending order: 0.833 > 0.571 > 0.4 > 0.375, which corresponds to 5:6 > 4:7 > 2:5 > 3:8.
Hence, the correct answer is 5 : 6 > 4 : 7 > 2 : 5 > 3 : 8.
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