The 2 angles are supplementary or add up to 180°, so we can equate it as:
(20x+ 5 ) + (24x - 1) = 180
now solve for x,
(20x+ 5 ) + (24x - 1) = 180
44x + 4 = 180
44x = 180 - 4
44x = 176
x = 176/44
x = 4
now solve for ∠C,
∠C = 20x + 5
∠C = 20(4) + 5
∠C = 80 + 5
∠C = 85°
Hence the answer is letter a. 85°
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