Correct: 27 - 6 = 21, 24 - 21 = 3, 37 - 27 = 10, 38 - 4 = 34, 49 - 25 = 24, 50 - 10 = 40 , 47 - 17 = 30, 39 - 17 = 22, Incorrect: 31-20 = 11, 8- 8 =4, 68 - 5 = 61, 79- 43 = 63, 97 - 62 = 53,

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