37, 10, 82 29, 11, 47 96, 15, 87 42, ?, 15

Answer is 6

37, 10, 82 - 3+7 = 10 & 8+2 = 10 29, 11, 47 - 2+9 = 11 & 4+7 = 11 96, 15, 87 - 9+6 = 15 & 8+7 = 15 42, ? , 15 - 4+2 = 6 & 1+5 = 6.

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