42 + 25 + 8 = 75
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67+8+9+42 = 126
32
You can't add 8 plus 25% because, 25% is not a real number. 8 plus 25% of 8 is 10.
25 + 8 = 33
Of the numbers in that list, the perfect squares are 4 (equal to ±22), 9 (equal to ±32), 16 (equal to ±42) and 25 (equal to ±52).