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B = C+60
so C = B-60
²/5b+b+b-60=180
¹²/5b - 60 = 180
¹²/5b = 240
12b = 1200
b = 100
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a = ²/5b = ²/5 × 100 = 40
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c = b-60 = 100-60 = 40
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