What property is 1/5+1/8=1/8+1/5?

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What is the first quartile of this data set? 10, 11, 12, 15, 17, 19, 22, 24, 29, 33, 38 a. 12 b. 19 c. 29 d. 10

Can you me find the missing length. i attached an image.