29
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90% of 61= 90% * 61= 0.9 * 61= 54.9
90 - 29 = 61
61 + 73 + 71 + 80 + 87 + 90 + 90 + 90 + 87 + 83 + 73 + 63 = 948 / 12 = 79 The average of the numbers is therefore 79.
9 + 26 + 61 + 8 + 18 + 44 + 10 + 90 = 266
All interior angles of any triangle amount to 180 degrees. 180-90-29 = 61 So the third angle will be 61 degrees.