54
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25+16+12+42+20=115
3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
12 - 3 + 42 = 51
11:42 plus 45 minutes is 12:27
30 + 12 = 42, 12 + 12 = 24, I am not completely sure on the answer as the two subtractions can be taken in either order, either resulting in: 42 - 24 + 18, 18 - 12 = 6, or 24 - 12 = 12, 42 - 12 = 30.